Hear piano vaguely with a receiver (8)
I believe the answer is:
earphone
'receiver' is the definition.
(I've seen this before)
'hear piano vaguely with a' is the wordplay.
'piano' becomes 'p'.
'vaguely' indicates an anagram.
'with' is a charade indicator (letters next to each other).
'a' becomes 'one'.
'hear'+'p'='hearp'
'hearp' is an anagram of 'earph'.
'earph'+'one'='EARPHONE'
(Other definitions for earphone that I've seen before include "Hope near (anag)" , "Hearing device" , "Audio receiver" , "One can" , "Personal sound receiver" .)