Not right to have sleep in it (5)
I believe the answer is:
inapt
'not right' is the definition.
(I've seen this in another clue)
'sleep in it' is the wordplay.
'sleep' becomes 'nap' (a nap is a short sleep).
'in' means one lot of letters goes inside another.
'nap' placed into 'it' is 'INAPT'.
'to have' is the link.
(Other definitions for inapt that I've seen before include "It's clumsy" , "Not fitting" , "unqualified" , "Free from deceit" , "Ill-suited" .)