Does he play for scratch teams (6)
I believe the answer is:
scorer
'does he play' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'scratch teams' is the wordplay.
'scratch' becomes 'score' (score is a kind of scratch).
'teams' becomes 'r' (I can't justify this - if you can you should believe this answer much more).
'score'+'r'='SCORER'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for scorer that I've seen before include "One gaining points" , "player achieving a touchdown?" , "Footballer having netted" , "Film music arranger" , "Keeper of the tally" .)