Bed used with hesitation? Nonsense! (6)
I believe the answer is:
bunkum
'nonsense' is the definition.
(I've seen this before)
'bed used with hesitation?' is the wordplay.
'bed' becomes 'bunk' (bunk is a kind of bed).
'used with' is a charade indicator (letters next to each other).
'hesitation?' becomes 'um' (um is said in hesitation).
'bunk'+'um'='BUNKUM'
(Other definitions for bunkum that I've seen before include "Slang nonsense, rubbish" , "Hot air" , "Hogwash, rubbish" , "Ludicrously false statements" , "Claptrap" .)