Crossword Genius

Hardest shape for fibres (7)

Ross

I believe the answer is:

threads

'fibres' is the definition.
(I have seen 'Thin fibres ' mean 'threads' so perhaps 'fibres' could also mean 'threads')

'hardest shape' is the wordplay.
'shape' indicates an anagram.
'hardest' is an anagram of 'THREADS'.

'for' acts as a link.

(Other definitions for threads that I've seen before include "Fine, twisted filaments" , "Clothing" , "Fine cords of twisted fibres" , "Clothes (slang)" , "Strands for sewing" .)

I've seen this clue in The Mirror.
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