Crossword Genius

Become more solid (6)


I believe the answer is:


'become more solid' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for harden that I've seen before include "Become less soft" , "Become stronger or firmer" , "Set; become tougher" , "Small fly" , "Temper, steel say" .)

I've seen this clue in The Sun.
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