Shot a quail finally -- that is for the keeper (6)
I believe the answer is:
goalie
'the keeper' is the definition.
(I've seen this before)
'shot a quail finally that is' is the wordplay.
'shot' becomes 'go' (I've seen this in other clues**).
'finally' says to take the final letters.
'that is' becomes 'ie' ('i.e.' can be a synonym of 'that is').
The last letter of 'quail' is 'l'.
'go'+'a'+'l'+'ie'='GOALIE'
'for' is the link.
(Other definitions for goalie that I've seen before include "Netkeeper, in short" , "Football team member" , "On-field custodian" , "one saves" , "Keeper (colloq.)" .)