Rule changed to accommodate married primate (5)
I believe the answer is:
lemur
'primate' is the definition.
(I've seen this before)
'rule changed to accommodate married' is the wordplay.
'changed' is an anagram indicator.
'to accommodate' indicates putting letters inside.
'married' becomes 'm'.
'rule' anagrammed gives 'leur'.
'leur' placed around 'm' is 'LEMUR'.
(Other definitions for lemur that I've seen before include "Malagasy primate" , "Bushy-tailed primate" , "Arboreal animal" , "Monkey-like aniaml of Madagascar" , "Animal with foxy face and long furry tail" .)