French pupil joining new soccer team? (6)
I believe the answer is:
eleven
'soccer team?' is the definition.
(I've seen this before)
'french pupil joining new' is the wordplay.
'french pupil' becomes 'eleve' ('student' in French).
'joining' says to put letters next to each other.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'eleve'+'n'='ELEVEN'
(Other definitions for eleven that I've seen before include "Time for morning coffee" , "Number of pipers piping" , "Football side" , "Football team; number" , "Odd number for a team" .)