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Really struggling today so any help appreciated.

Reflected gleam in eye to become ignited (10)
CA?C?L?G?T

Termite will not accept trouble on the way back (4,3)
?O?D /?N?

Two we hear entering Arizona with gazetteer (1,2,1)
A / ?O / ?

Crystalline solid coming from a chimney in Scotland (4)
A???

4 A To Z, gazetteer, map.

5 Alum, crystalline solid. It's A Lum, a chimney in Scotland.

Malone

Many thanks.

2. Wood Ant, termite. Won't, will not and Ado, trouble (on the way back = reverse, so Oda).

Glad I could help.

Malone

Yes, your help is much appreciated.

The first one looks like Catch Light, become ignited - but I don't know how the rest of it works...and that'd be two words anyway!

Catch light or catchlight is a light source that causes a specular highlight in a subject's eye in an image. They are also referred to as eye lights or Obies, the latter a reference to Merle Oberon, for whom the light was invented by then husband and cinematographer, Lucien Ballard.
Catch light - Wikipedia

Thanks, Rossim. I'd checked Chambers earlier and there was no mention of it...yet I felt it was right!