Hear song (5)
I believe the answer is:
catch
This clue is a double definition.
'hear' is the first definition.
(catching is a kind of hearing)
'song' is the second definition.
(old-fashioned type of musical composition)
(Other definitions for catch that I've seen before include "Trap (a batsman?)" , "Drawback that's not immediately evident" , "Snag; be in time for (train)" , "Concealed difficulty" , "Desirable partner" .)