The chap dropped the ball-point (6)
I believe the answer is:
fellow
'the chap' is the definition.
('fellow' can be a synonym of 'chap')
'dropped the ball-point' is the wordplay.
'dropped' becomes 'fell' (I've seen this before).
'the ball' becomes 'o'.
'point' becomes 'w' (W is an example).
'fell'+'o'+'w'='FELLOW'
(Other definitions for fellow that I've seen before include "Senior member of a college or university" , "Neglected child" , "The other of a pair, or a college member" , "Comrade" , "Bloke; senior member of college" .)