Is footballer blocking Everton's last delivery? (9)
I believe the answer is:
inswinger
'delivery?' is the definition.
(cricket delivery)
'is footballer blocking everton's last' is the wordplay.
'footballer' becomes 'winger' (winger is a type of footballer).
'blocking' is an insertion indicator (to block can mean to block in or contain).
'last' suggests the final letters.
The final letter of 'everton' is 'n'.
'is'+'winger'='iswinger'
'iswinger' placed around 'n' is 'INSWINGER'.
(Other definitions for inswinger that I've seen before include "moving ball" , "delivery curling through air" , "swerving delivery" , "ball from fast bowler" , "Swerving ball" .)