In addition, thanks Tony, Ros, AB and Peterm. Well solved. It looks like I'll never have an 'unsolvable' one again. You experts and too... well... expert. I try to avoid answers to which require looking up (although relievo is not yer common-usage word).
For completion, here is my working:-
1. ‘over’ [retiring] = revo; lie ‘in’ = re(lie)vo = RELIEVO = appearance of relief (Chambers D)
2. neat = trim; + anag(orderly) of ‘trees’; yields TRIMESTER = academic term.
3. “brought up + embracing” (it’s “in” there, backwards) SPECTER (N Am spelling of spectre) = a haunting fear (Chambers Dict)
4. larn = to teach (dialect or facetious) Chambers D; + E = LARNE. It’s in N.I.
5. hit = LASH (lash = hit in Chambers and Oxford Thesauri): Finland = FIN (IVR);
hit in Finland = FLASH IN. at that time = THEN; pop = PA; ‘then’ inspired (took in) ‘pa’ = THE PAN yielding FLASH IN THE PAN = briefly successful (Chambers D).
The comma after Finland breaks the clue into two parts.
Thabks a million for having a go. Hope you enjoyed them. See you next week (hopefully). Off to my 7-courser now.
Bless
John