Remove stones from pockets, reversing element of race strategy (3,4)
I believe the answer is:
pit stop
'race strategy' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'remove stones from pockets reversing element' is the wordplay.
I cannot really see how this works, but
'remove' could be 'pit' (pitting is a kind of removing) and 'pit' is found within the answer.
'stones' could be 'st' (I've seen this in other clues) and 'st' is located in the answer.
'from' could be 'o' (I've seen this in other clues) and 'o' is found within the answer.
'element' could be 'p' (P is an example) and 'p' is located in the answer.
No letters remain.
This explanation may well be incorrect...
'of' is the link.
Can you help me to learn more?
(Other definitions for pit stop that I've seen before include "brief service" , "F1 race feature" , "When tripping, break" , "Break for fuel etc." , "Break during motor race" .)