Notes that repeat poolroom secrets regularly put up (7)
I believe the answer is:
tremolo
'notes that repeat' is the definition.
The answer and definition are not the same part of speech.
'poolroom secrets regularly put up' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'put up' is a reversal indicator.
'poolroom'+'secrets'='poolroomsecrets'
The alternating letters of 'poolroomsecrets' are 'olomert'.
'olomert' back-to-front is 'TREMOLO'.
Can you help me to learn more?
(Other definitions for tremolo that I've seen before include "effect of repeated bowing" , "Wavering note" , "Quivering musical effect" , "Quivering effect (in music)" , "Musical wavering effect" .)