Did he mess up the replay? (6)

I believe the answer is:

player

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'did he mess' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'up the replay?' is the wordplay.
'up' is an anagram indicator.
'replay' is an anagram of 'PLAYER'.

Can you help me to learn more?

(Other definitions for player that I've seen before include "South African golfer, b. 1935" , "Sports participant" , "Sports team member" , "Performer" , "Actor - footballer?" .)

I've seen this clue in the Evening Standard.

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