Sarcastic agent supplies pen (4)

I believe the answer is:

cage

'pen' is the definition.
(I've seen this in other clues)

'sarcastic agent supplies' is the wordplay.
'supplies' indicates a hidden word (I've seen 'supplying' mean this).
'CAGE' can be found hidden inside 'sarcastic agent'.

(Other definitions for cage that I've seen before include "Hutch" , "Place of confinement" , "Animal enclosure with bars" , "Barred accommodation for animal" , "Barred container" .)

I've seen this clue in The Sun.

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