Cricketer out in the middle: Robin helped him (6)
I believe the answer is:
batman
'robin helped him' is the definition.
(Batman and Robin)
'cricketer out in the middle' is the wordplay.
'cricketer' becomes 'batsman' (batsman is a type of cricketer).
'out in the middle' suggests removing the centre.
'batsman' with its middle taken out is 'BATMAN'.
(Other definitions for batman that I've seen before include "Officer's servant; the Caped Crusader" , "Cartoon hero or officer's servant" , "Officer's attendant" , "who'd fight crime?" , "Officer's personal servant" .)