Love little jerk of the ear? (4)
I believe the answer is:
otic
'of the ear?' is the definition.
(I've seen this before)
'love little jerk' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'little jerk' becomes 'tic' (jerking movement by the body).
'o'+'tic'='OTIC'
(Other definitions for otic that I've seen before include "about hearing" , "Relating to ears" , "Relating to the ear" , "relating to area incorporating canal" , "of concern to the listener" .)