Nick is refusing to have letters on taps? (5)
I believe the answer is:
notch
'nick' is the definition.
(both can mean a small cut or impression)
'refusing to have letters on taps?' is the wordplay.
I cannot quite understand how this works, but
'taps?' could be 'ch' (I've seen this in other clues) and 'ch' is found in the answer.
The remaining letters 'not' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'is' is the link.
Can you help me to learn more?
(Other definitions for notch that I've seen before include "Secure" , "small score?" , "Salad plant, garnish" , "Make the cut" , "Nick made in something as a record" .)