Drink repeatedly over cardiac glitch (6)
I believe the answer is:
murmur
'cardiac glitch' is the definition.
The definition and answer can be both states of affairs as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'drink repeatedly over' is the wordplay.
'drink' becomes 'rum' (rum is a kind of drink).
'repeatedly' becomes 'rum' (I can't justify this - if you can you should give a lot more credence to this answer).
'over' is a reversal indicator.
'rum'+'rum'='rumrum'
'rumrum' reversed gives 'MURMUR'.
Can you help me to learn more?
(Other definitions for murmur that I've seen before include "Whisper; complain" , "Undertone" , "Speak quietly" , "Soft voices (of discontent)" , "Low continuous sound" .)