Crossword Genius

Solvent, cut off daughter and son for a laugh (2,3)

Ross

I believe the answer is:

in fun

'for a laugh' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

(Other definitions for in fun that I've seen before include "Not intended seriously" , "As a joke - not seriously" , "to raise a smile?" , "for a laugh" .)

I've seen this clue in The Times.
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