Crossword Genius

Athlete flailing another arm (10)

Ross

I believe the answer is:

marathoner

'athlete' is the definition.
(marathoner is a kind of athlete)

'flailing another arm' is the wordplay.
'flailing' indicates an anagram.
'another'+'arm'='anotherarm'
'anotherarm' anagrammed gives 'MARATHONER'.

(Other definitions for marathoner that I've seen before include "runner" , "athlete" .)

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