One of two discs moved inside record player, making room for karate? (4)
I believe the answer is:
dojo
'room for karate?' is the definition.
The definition suggests a singular noun which matches the answer.
'one of two discs moved inside record player' is the wordplay.
I cannot really understand how this works, but
'of' could be 'o' and 'o' is located in the answer.
'record player' could be 'dj' (DJs play records) and 'dj' is found within the leftover letters.
A single letter 'o' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'making' is the link.
Can you help me to learn more?
(Other definitions for dojo that I've seen before include "Combat centre" , "place of karate" .)