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