Each across clue’s wordplay indicates a repeated letter not required in its solution and each down solution requires a repeated letter, not indicated in its wordplay.
4d Box for one found to the right of aisle's opening in the theatre (4) ?R?E assume the answer is tree (box tree/shrub for the defn) The wordplay should give TRE.... is that tr for theatre + e from right hand end of aisle?
17a Drive opens up delicate chip shot at the nineteenth?(5) D?I?K drink must be the answer (defn shot at the 19th) dr for drive ? where does chip come into it?
22a Had settled game with if before dispute (8) L?T?G?T? litigate ...lit (had settled/landed) + tig (game) ? but the rest?
(in sport) a softly struck hit or kick of the ball that drops abruptly to the ground.
‘a brilliantly controlled backhand dink over the net’
chip----(in football, golf, and other sports) a short lofted kick or shot.
"he made no mistake with a chip and a par putt from four feet to seal victory"