Sweet sauce for cartoon cat (7)

I believe the answer is:

custard

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

I can't explain the remainder of the clue.

(Other definitions for custard that I've seen before include "Yellow mixture" , "Cooked mixture of milk and eggs" , "Yellow sauce" , "Pudding accompaniment" , "Sweet sauce made with milk and eggs" .)

I've seen this clue in The Sun.

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