Monopoly token replaced by a cat (4)
I believe the answer is:
iron
'monopoly token replaced by a cat' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for iron that I've seen before include "Box-shaped instrument of torture -- no meridian (anag)" , "Flatten; element" , "Wellington was known as the .... Duke" , "sort of club" , "Hard metal" .)