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1 Across Sp = middle two letters of 'atmosphere, so in the centre +Rightly, fairly.

Given up so cheated to get the remaining answers, loads of which I still do not understand.

52a Sun's now all we're aware of in garden? (7)
Why weekend?
15a Roundabout or what looks like one desolate we understand (7)
Why oblique?
10d Girl of 14's seen at party (10)
Why Dolores?
47a Means, indeed, always to include five reservists at sea (4,4)
Why wavy navy?

52 WE KEN is "we're aware" - don't see the ED, though
15 "homophone of "bleak" (desolate) - don't see the O
10 DO for party - does 14 explain LORES?
47 WAY with V in? AY is always - don't see the rest (definition is slang for navy reservists)

The way I see it, 15A is "roundabout" , which is "oblique", and then,
alternatively, "O" for roundabout + BLEAK (desolate).
Incidentally, I'm stuck on these:-
43 Across - "Norwegian lake you can evidently cross by car? "( 5) R-A-D
46 Down - "Begin to go through scale model with this?" (4-3) P-A- --H 53 Across - "One's online business, something tiny, picked up." (9)
--T-O---R
48 Down - "Greek island's conveniently laid on medics." (6) -A---S
21 Across - "Take the 4x4 across the channel." (5) S-I-E

43 Roald (Dahl), Norwegian. Road with L, lake inside.

46 Play Doh, model with this. (and Play Doh, go through the musical scale)

21 Seize, take and French (across the channel) for 16, 4 x 4.

48 Patmos, Greek island.

Pat - conveniently
Mos, MOs, medical officers, medics.

48d - pat (conveniently laid) mos (abbreviation for medics)
21a - seize (french for sixteen)

Many thanks, Malone and Son1of rover1 - that's a big help - I hadn't heard of Patmos before. The one left over (53A), looks like being DOTCOMMER - this compiler sure loves his computer terms!

Finished it but without too much pleasure. And 30a is curious as Orlando, according to my reference works, is a name of Italian origin, not Spanish.