Use excessive embellishment (4,3,4)

I believe the answer is:

gild the lily

(Other definitions for gild the lily that I've seen before include "Attempt to beautify that which is already beautiful" , "Over-adorn" , "Enhance what is already excellent" , "Adorn unnecessarily something already beautiful" , "put too much make-up on?" .)

I've seen this clue in The Guardian.

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