Piece knocked off eg marble counter (4)
I believe the answer is:
chip
'counter' is the definition.
(I know that chip is a type of counter)
'piece knocked off eg marble' is the wordplay.
I cannot really understand how this works, but
'piece' could be 'hip' (hip is a kind of piece) and 'hip' is located in the answer.
A single letter 'c' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for chip that I've seen before include "Sliver of wood or piece of potato" , "Damage" , "Deep-fried potato slice" , "Approach shot at 1 across" , "Small fragment of wood" .)