Security number supplied by idiots produces irritations (9)

I believe the answer is:

pinpricks

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'irritations' is the definition.
(I know this)

'security number supplied by idiots' is the wordplay.
'security number' becomes 'pin' (a PIN number - personal identification number).
'supplied by' says to put letters next to each other.
'idiots' becomes 'pricks' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'pin'+'pricks'='PINPRICKS'

'produces' acts as a link.

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I've seen this clue in The Independent.

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