Infuriate a Green convert (6)
I believe the answer is:
enrage
'infuriate' is the definition.
(I've seen this before)
'a green convert' is the wordplay.
'convert' is an anagram indicator (I've seen 'converting' mean this).
'a'+'green'='agreen'
'agreen' anagrammed gives 'ENRAGE'.
(Other definitions for enrage that I've seen before include "Make mad" , "put in a stir?" , "Incense" , "Madden, make very angry" , "Drive to anger" .)