Fielder for one second blocking rising ball (3,4)
I believe the answer is:
leg slip
'fielder' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
(Other definitions for leg slip that I've seen before include "On-side fielder" , "that may be found in field" , "Cricketer" , "Fielding position" , "One hoping to hold ball" .)