Crossword Genius

Consider money needed for parking in Jersey (4,4)

Ross

I believe the answer is:

mull over

'consider' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

(Other definitions for mull over that I've seen before include "Ruminate, ponder" , "Consider" .)

I've seen this clue in The Guardian.
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