Student in a different pine, say, outside (7)
I believe the answer is:
trainee
'student' is the definition.
(I've seen this before)
'in a different pine say outside' is the wordplay.
'different' indicates an anagram (letters placed in a different order).
'pine say' becomes 'tree' (pine is a kind of tree).
'outside' is an insertion indicator (some letters go outside others).
'in'+'a'='ina'
'ina' is an anagram of 'ain'.
'ain' going within 'tree' is 'TRAINEE'.
(Other definitions for trainee that I've seen before include "Person being taught" , "Person under instruction" , "encountered bad weather in driving area" , "Aintree (anag.)" , "novice" .)