Rubbish place to sleep? I'm not sure (6)

I believe the answer is:

bunkum

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'rubbish' is the definition.
(thesaurus)

'place to sleep? i'm not sure' is the wordplay.
'place to sleep?' becomes 'bunk' (I can't justify this - if you can you should give a lot more credence to this answer).
'i'm not sure' becomes 'um' (expression of hesitation).
'bunk'+'um'='BUNKUM'

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(Other definitions for bunkum that I've seen before include "Claptrap" , "Codswallop, hogwash" , "Slang nonsense, rubbish" , "bombast" , "Drivel" .)

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