Reminders that a key can be put to use! (4)
I believe the answer is:
cues
'reminders that a key' is the definition.
'cues' can be an answer for 'reminders' (I've seen this in another clue). I'm unsure of the rest of the definition.
'put to use' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'use' is 'ues' which is located in the answer.
A single letter 'c' 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 be' acts as a link.
Can you help me to learn more?
(Other definitions for cues that I've seen before include "Snooker ball strikers" , "Snooker rods" , "Prompts for action" , "Actors' signals" , "Actor's signal" .)