Burning forest close to coast (6)
I believe the answer is:
ardent
'burning' is the definition.
(thesaurus)
'forest close to coast' is the wordplay.
'forest' becomes 'arden' (I've seen this before).
'close to' indicates one should take the final letters (the close/ending of).
The final letter of 'coast' is 't'.
'arden'+'t'='ARDENT'
(Other definitions for ardent that I've seen before include "Very keen" , "'Fervent, impassioned (6)'" , "Ranted, being passionate" , "Loving and fiery" , "Passionate, fervent" .)