It gives pain to the listener (7)
I believe the answer is:
earache
'it' is the definition.
The definition suggests a singular noun which matches the answer.
'pain to the listener' is the wordplay.
'pain' becomes 'ache' (ache is a kind of pain).
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'the listener' becomes 'ear' (body part which hears or listens).
'ache' put after 'ear' is 'EARACHE'.
'gives' acts as a link.
Can you help me to learn more?
(Other definitions for earache that I've seen before include "may involve hammer and anvil" , "Otic pain" , "Aural discomfort" , "pain (from hairdryer treatment?)" , "Lughole pain" .)