Crossword Genius

Needing exercise, one circles a furlong (5)

Ross

I believe the answer is:

unfit

'needing exercise' is the definition.
(someone unfit might need to exercise)

'one circles a furlong' is the wordplay.
'one' becomes 'unit' (synonyms).
'circles' indicates putting letters inside.
'a furlong' becomes 'f' (abbreviation for furlong, a unit of length).
'unit' placed around 'f' is 'UNFIT'.

(Other definitions for unfit that I've seen before include "Inapt" , "Inappropriate" , "Ill-equipped" , "Ill-suited" , "Ill - out of shape" .)

I've seen this clue in The Guardian.
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