Humour eluding criminal (7)
I believe the answer is:
'humour' is the definition.
(I've seen this before)
'eluding criminal' is the wordplay.
'criminal' indicates anagramming the letters.
'eluding' with letters rearranged gives 'INDULGE'.
(Other definitions for indulge that I've seen before include "Yield to the wishes of" , "Mollycoddle -- eluding (anag)" , "Give free rein to" , "Gratify a wish" , "Pander to" .)