Make trifling objection about six pound (5)

I believe the answer is:

cavil

'make trifling objection' is the definition.

'about six pound' is the wordplay.
'about' becomes 'ca' (abbreviation for 'circa').
'six' becomes 'VI' (Roman numerals).
'pound' becomes 'L' (the pound sign is based on an L).
'ca'+'vi'+'l'='CAVIL'

(Other definitions for cavil that I've seen before include "Carp" , "Quibble" , "Make petty objections" , "Find fault" , "Complain" .)

I've seen this clue in the Sydney Morning Herald.

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