Repeatedly questions MP involved in discharge (5)
I believe the answer is:
pumps
'repeatedly questions' is the definition.
'pumps' can be an answer for 'questions' (as in to pump someone for information). I am not sure about the 'repeatedly' bit.
'mp involved in discharge' is the wordplay.
'involved in' indicates putting letters inside.
'discharge' becomes 'pus' (discharge from the body).
'mp' put inside 'pus' is 'PUMPS'.
Can you help me to learn more?
(Other definitions for pumps that I've seen before include "Plimsolls" , "causes of inflation?" , "Dancing shoes - may be manned!" , "Water-raising devices" , "Moves fluid or gas by pressure or suction" .)