It concerns power to broadcast service (6)
I believe the answer is:
repair
'service' is the definition.
(I've seen this in another clue)
'it concerns power to broadcast' is the wordplay.
I cannot quite see how this works, but
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is present in the answer.
'power' could be 'p' (symbol in physics) and 'p' is found within the answer.
'broadcast' could be 'air' (to air on TV) and 'air' is found within the answer.
A single letter 'r' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for repair that I've seen before include "Go - fix" , "Travel or proceed toward some place" , "Correct" , "Get back into good shape" , "Once, return" .)