Crossword Genius

Mock gross judge (4-7)

Ross

I believe the answer is:

make-believe

'mock' is the definition.
(thesaurus)

'gross judge' is the wordplay.
'gross' becomes 'make' (as in grossing or making a certain amount of money).
'judge' becomes 'believe' (believing is a kind of judging).
'make'+'believe'='MAKE-BELIEVE'

(Other definitions for make-believe that I've seen before include "Fantasy" , "Pretence" .)

I've seen this clue in The Telegraph.
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