Crossword Genius

Determined to assume a certain hardness (3)

Ross

I believe the answer is:

set

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'determined' is the definition.
(synonyms)

I can't explain the rest of the clue.

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(Other definitions for set that I've seen before include "Group; unchanging" , "Mount (gem); scenery" , "Group; hard" , "number of games" , "Fix; lay" .)

I've seen this clue in the Evening Standard.
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