Team assembled by the Spanish, no less (6)
I believe the answer is:
eleven
'team' is the definition.
(eleven is a kind of team)
'the spanish no less' is the wordplay.
'the spanish' becomes 'el' ('the' in Spanish).
'no less' becomes 'even' (both are used to emphasise something surprising).
'el'+'even'='ELEVEN'
'assembled by' acts as a link.
(Other definitions for eleven that I've seen before include "Number on a soccer team" , "Cardinal" , "one by one?" , "Not first team (6,6) - See 24" , "Number killed in the Peterloo massacre" .)