Forest close to Parkhurst is burning (6)
I believe the answer is:
ardent
'is burning' is the definition.
(thesaurus)
'forest close to parkhurst' 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 last letter of 'parkhurst' is 't'.
'arden'+'t'='ARDENT'
(Other definitions for ardent that I've seen before include "very interested" , "Ranted badly and became earnest in love" , "Fervid" , "Burning, passionate" , "Ranted, being impassioned" .)