Accusers regularly provide such signals (4)
I believe the answer is:
cues
'such signals' is the definition.
'cues' can be an answer for 'signals' (I've seen this in another clue). I'm not sure about the 'such' bit.
'accusers regularly' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternating letters of 'accusers' are 'CUES'.
'provide' is the link.
Can you help me to learn more?
(Other definitions for cues that I've seen before include "Signals for action" , "Actor's signal" , "Snooker ball strikers" , "Actors' signals" , "Prompts for action" .)