Charge around gym and show remorse (6)
I believe the answer is:
repent
'show remorse' is the definition.
(I've seen this in another clue)
'charge around gym' is the wordplay.
'charge' becomes 'rent' (I've seen this in other clues).
'around' means one lot of letters goes inside another.
'gym' becomes 'pe' (short for Physical Education).
'rent' placed around 'pe' is 'REPENT'.
'and' is the link.
(Other definitions for repent that I've seen before include "creeping along the ground" , "Turn away from sin" , "lying on the ground" , "John the Baptist's cry" , "Feel sincere regret" .)