Wobble on the first shot then have a better second half (6)
I believe the answer is:
teeter
'wobble' is the definition.
(I've seen this before)
'on the first shot then have a better second half' is the wordplay.
'on' is a charade indicator (letters next to each other).
'the first shot then have' becomes 'tee' (I am not sure about this - if you are sure you should believe this answer much more).
'second half' suggests halving the letters.
'better' cut in half is 'ter'.
'tee' put next to 'ter' is 'TEETER'.
Can you help me to learn more?
(Other definitions for teeter that I've seen before include "Hesitate on the brink" , "Rock unsteadily on feet" , "Sway, as if about to fall" , "Wobble on the brink" , "Rock unsteadily on edge" .)