Jerk outside court with adult signalling of course (3-3)
I believe the answer is:
tic-tac
'signalling of course' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'jerk outside court with adult' is the wordplay.
'jerk' becomes 'tic' (I've seen this in another clue).
'outside' is an insertion indicator.
'court' becomes 'ct' (abbreviation used in road names).
'with' says to put letters next to each other.
'adult' becomes 'a' (abbreviation).
'ct'+'a'='cta'
'tic' placed around 'cta' is 'TIC-TAC'.
Can you help me to learn more?
(Other definitions for tic-tac that I've seen before include "Racecourse bookmakers' signalling system" , "Bookies'' system of arm signals" , "Bookmaker's arm signals" , "Racecourse bookmakers' telegraphy" .)