Crossword Genius

Harden or soften (6)

Ross

I believe the answer is:

temper

This clue is a double definition.

'harden' is the first definition.
('temper' can be a synonym of 'harden')

'soften' is the second definition.
(thesaurus)

'or' is the link.

(Other definitions for temper that I've seen before include "Toughen by gradually heating and cooling" , "Adjust" , "Mood or hardness of metal" , "Tendency to become angry easily" , "Harden with heat and water" .)

I've seen this clue in The Telegraph.
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