Crossword Genius

Strain of working in stone (7)

Ross

I believe the answer is:

tension

'strain' is the definition.
(I know that tension is a type of strain)

'working in stone' is the wordplay.
'working' indicates an anagram.
'in'+'stone'='instone'
'instone' with letters rearranged gives 'TENSION'.

'of' is the link.

(Other definitions for tension that I've seen before include "Assay" , "Strained state" , "anxious state" , "nerves" , "One isn't (anag.)" .)

I've seen this clue in The Telegraph.
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