Best point to target treat jar (5,4)
I believe the answer is:
sweet spot
'best' is the definition.
I know nothing about this answer so I can't tell whether this works.
'point to target treat jar' is the wordplay.
'point' becomes 's' (S is an example).
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'target treat' becomes 'sweet' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'jar' becomes 'pot' (I've seen this in other clues).
's' after 'sweet' is 'sweets'.
'sweets'+'pot'='SWEET SPOT'
Can you help me to learn more?
(Other definitions for sweet spot that I've seen before include "Best point of racket or bat when hitting the ball" , "Area on club, racket or bat that makes best contact with the ball" , "providing an optimum combination of qualities" , "Best place to make contact" , "Best area on, eg, tennis racket" .)