Toff completely foul at Lord's (2-4)

I believe the answer is:

no-ball

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'foul at lord's' is the definition.
The definition suggests a singular noun which matches the answer.

'toff completely' is the wordplay.
'toff' becomes 'nob' (UK slang for a wealthy or upper-class person).
'completely' becomes 'all' (synonyms).
'nob'+'all'='NO-BALL'

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(Other definitions for no-ball that I've seen before include "Illegal delivery by bowler in cricket" , "Extra, in cricket" .)

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