Chap hanging on the line? (3)
I believe the answer is:
bob
'the line?' is the definition.
(I have seen 'line of verse' mean 'bob' so perhaps 'line' could also mean 'bob')
'chap hanging' is the wordplay.
'chap' becomes 'bo'.
'hanging' becomes 'b' (I can't explain this - if you can you should believe this answer much more).
'bo'+'b'='BOB'
'on' is the link.
Can you help me to learn more?
(Other definitions for bob that I've seen before include "Brief curtsy - hairstyle" , "Quick curtsey" , "Hairstyle cut shortly and evenly all round" , "Quick curtsy" , "Pre-decimal coin" .)