Forest close to airport burning (6)
I believe the answer is:
ardent
'burning' is the definition.
(both can mean passionate)
'forest close to airport' is the wordplay.
'forest' becomes 'arden' (forest in Shakespeare's As You Like It).
'close to' suggests the final letters (the 'close' to the word).
The last letter of 'airport' is 't'.
'arden'+'t'='ARDENT'
(Other definitions for ardent that I've seen before include "Having great warmth of feeling like a lover" , "full of zeal" , "Warm and loving" , "Ranted, being passionate" , "Fervid" .)