Team frequently dealt with No. 2! (6)
I believe the answer is:
eleven
'team' is the definition.
(eleven is a kind of team)
'frequently dealt with no 2' is the wordplay.
'frequently' means one should take alternating letters (letters selected at a regular frequency).
'with no v' becomes 'even' (I can't explain this - if you can you should believe this answer much more).
The alternate letters of 'dealt' are 'el'.
'el'+'even'='ELEVEN'
(Other definitions for eleven that I've seen before include "Number killed in the Peterloo massacre" , "Age to start secondary education" , "Enough for a soccer side" , "Lowest two-digit prime" , "Football side" .)