Crossword Genius

At liberty to make no charge (4)

Ross

I believe the answer is:

free

I believe this clue is a double definition.

'at liberty' is the first definition.
('free' can be similar in meaning to 'at liberty')

'no charge' is the second definition.
('free' can be a synonym of 'gratis')

'to make' acts as a link.

(Other definitions for free that I've seen before include "Not under restraint" , "unoccupied)" , "Reef (anag.)" , "without payment" , "with no toll demanded?" .)

I've seen this clue in the Evening Standard.
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