A plot that's obviously not working (4)

I believe the answer is:

abed

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'that's obviously not working' is the definition.
I can't tell whether this defines the answer.

'a plot' is the wordplay.
'plot' becomes 'bed' (a plot of land).
'a'+'bed'='ABED'

Can you help me to learn more?

(Other definitions for abed that I've seen before include "in retirement, possibly?" , "having a lie-in?" , "Having not got up" , "Bead (anag.)" , "laid up" .)

I've seen this clue in the Evening Standard.

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