Crossword Genius

Lose lustre like small mountain lake? (7)

Ross

I believe the answer is:

tarnish

I believe this is a double definition.

'lose lustre' is the first definition.
(I've seen this before)

'like small mountain lake?' is the second definition.
(tarn can mean a lake by a mountain)

(Other definitions for tarnish that I've seen before include "Stain or discolour, say metal" , "Stain, metal or reputation" , "Stain or blemish, silver or reputation" , "Become dull and discoloured" , "Stain or blemish as with silverware" .)

I've seen this clue in The Sun.
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