Team in the Spanish square (6)
I believe the answer is:
eleven
'team' is the definition.
(I know that eleven is a type of team)
'the spanish square' is the wordplay.
'the spanish' becomes 'el' ('the' in Spanish).
'square' becomes 'even' (both mean 'owing nothing' as in 'we're all square').
'el'+'even'='ELEVEN'
'in' is the link.
(Other definitions for eleven that I've seen before include "Cricket 18" , "Football or cricket team?" , "Football side" , "Number in a cricket team" , "Cardinal" .)