In bed I'm withdrawn, what a fool (6)

I believe the answer is:

dimwit

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

'in bed i'm withdrawn what' is the wordplay.
'in' indicates the answer is hidden within the clue.
'DIMWIT' is hidden within 'bed im withdrawn what'.

(Other definitions for dimwit that I've seen before include "Nit" , "Fool" , "idiot!" , "Silly person (not nitwit)" , "Stupid person" .)

I've seen this clue in The Telegraph.

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