Spanish team, formerly (4)
I believe the answer is:
once
I believe this clue is a double definition.
'spanish team' is the first definition.
(Spanish for 'eleven', therefore a football team)
'formerly' is the second definition.
('once' can be a synonym of 'formerly')
(Other definitions for once that I've seen before include "Formerly; as soon as" , "In the old days" , "One-time musical film and song" , "Singly" , "In times past" .)