Examination on the outskirts of temperate rain forest (4)
I believe the answer is:
test
'examination' is the definition.
('test' can be a synonym of 'examination')
'on the outskirts of temperate rain forest' is the wordplay.
'on' is a charade indicator (letters next to each other).
'outskirts of' means to remove the middle letters.
'temperate rain forest' becomes 'st' (I can't justify this - if you can you should believe this answer much more).
'the' with its centre taken out is 'te'.
'te' put next to 'st' is 'TEST'.
Can you help me to learn more?
(Other definitions for test that I've seen before include "Analyse" , "Examine to play international cricket match" , "Check" , "big game" , "criterion" .)