Setter retracted error one's there to catch (3,4)
I believe the answer is:
leg slip
'one's there to catch' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'setter retracted error' is the wordplay.
'setter' becomes 'gel' (something which sets).
'retracted' says the letters should be written backwards.
'error' becomes 'slip' (slip is a kind of error).
'gel' back-to-front is 'leg'.
'leg'+'slip'='LEG SLIP'
Can you help me to learn more?
(Other definitions for leg slip that I've seen before include "Cricketer" , "Fielding position" , "On-side fielder" , "One hoping to hold ball" , "One in the field" .)