Crossword Genius

Extra swell for everybody? (2,4)

Ross

I believe the answer is:

no ball

I'm a little stuck... Click here to teach me more about this clue!

'extra' is the definition.
(I've seen this before)

'swell for everybody?' is the wordplay.
'swell for' becomes 'nob' (I can't explain this - if you can you should give a lot more credence to this answer).
'everybody?' becomes 'all' (I've seen this before).
'nob'+'all'='NO-BALL'

Can you help me to learn more?

(Other definitions for no ball that I've seen before include "bad delivery" , "Illegal delivery" , "Disallowed delivery" , "Extra in cricket" , "Botched delivery" .)

I've seen this clue in the Evening Standard.
Want a hint initially instead of a full solution? Install my app