Male cat, black, in crypt (4)
I believe the answer is:
tomb
'crypt' is the definition.
(thesaurus)
'male cat black' is the wordplay.
'male cat' becomes 'tom' (I've seen this before).
'black' becomes 'b' (as in pencil classifications).
'tom'+'b'='TOMB'
'in' is the link.
(Other definitions for tomb that I've seen before include "Place for the burial of a corpse" , "Resting place" , "grave situation" , "remains here" , "Catacomb" .)