Crossword Genius

Staying power in a man -- it's unusual! (7)

Ross

I believe the answer is:

stamina

'staying power' is the definition.
(synonyms)

'a man it's unusual' is the wordplay.
'unusual' indicates an anagram.
'a'+'man'+'its'='amanits'
'amanits' anagrammed gives 'STAMINA'.

'in' acts as a link.

(Other definitions for stamina that I've seen before include "Staying power, ability to withstand prolonged strain" , "Ability to maintain effort" , "Parts of flowers" , "capacity to endure" , "Vigour" .)

I've seen this clue in The Telegraph.
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