Luxuriate with permit (6)
I believe the answer is:
wallow
'luxuriate' is the definition.
(I've seen this in another clue)
'with permit' is the wordplay.
'with' becomes 'w' (abbreviation).
'permit' becomes 'allow' (synonyms).
'w'+'allow'='WALLOW'
(Other definitions for wallow that I've seen before include "Roll around as in mud" , "Luxuriate (in mud, muck)" , "Lie about in mud or water" , "Roll about as in water or mud" , "Indulge excessively, in self-pity perhaps" .)