Men amid boxing ring belted figure seen in the dark (5)
I believe the answer is:
orion
'belted figure seen in the dark' is the definition.
I can't tell whether this definition defines the answer.
'men amid boxing ring' is the wordplay.
'men' becomes 'OR' (military abbreviation for Other Ranks).
'amid' becomes 'in'.
'boxing' is an insertion indicator ('box' can mean contain, as in to put in a box).
'ring' becomes 'O' (letter resembling a ring).
'in' enclosing 'o' is 'ion'.
'or'+'ion'='ORION'
Can you help me to learn more?
(Other definitions for orion that I've seen before include "Great hunter of Greek myth, and a constellation" , "Constellation with seven bright stars" , "Mythical Greek hunter turned into constellation" , "Great hunter of Greek legend and a constellation" , "Greek hunter became a constellation" .)