Hear possibly bawdy round (5)
I believe the answer is:
catch
This might be a double definition.
'hear' is the first definition.
(catching is a kind of hearing)
'bawdy round' is the second definition.
'catch' can be an answer for 'round' (catch is a type of musical round or song). I am unsure of the 'bawdy' bit.
'possibly' is the link.
Can you help me to learn more?
(Other definitions for catch that I've seen before include "Snag - trap" , "potential partner?" , "Understand" , "(To) snare, net" , "Grab; disadvantage" .)