Jumps end of hurdle in circuits (5)
I believe the answer is:
leaps
'jumps' is the definition.
(leap is a kind of jump)
'end of hurdle in circuits' is the wordplay.
'end of' indicates one should take the final letters.
'in' is an insertion indicator.
'circuits' becomes 'laps' ('lap' can be a synonym of 'circuit').
The final letter of 'hurdle' is 'e'.
'e' going into 'laps' is 'LEAPS'.
(Other definitions for leaps that I've seen before include "Pales in vaults" , "Jumps or bounds" , "Jumps or springs suddenly" , "Pales (anag.)" , "Makes fast progress - by . . . . . and bounds" .)