A stupid old oaf delivers this much codswallop (1,4,2)

I believe the answer is:

a load of

'this much codswallop' is the definition.
(as in the phrase 'a load of codswallop')

'a stupid old oaf' is the wordplay.
'stupid' indicates an anagram (in a stupid order).
'old'+'oaf'='oldoaf'
'oldoaf' is an anagram of 'loadof'.
'a'+'loadof'='A LOAD OF'

'delivers' is the link.

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