Sure to have new crate at home (7)
I believe the answer is:
certain
'sure' is the definition.
(I know that sure can be written as certain)
'new crate at home' is the wordplay.
'new' indicates an anagram.
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'crate' with letters rearranged gives 'certa'.
'certa'+'in'='CERTAIN'
'to have' acts as a link.
(Other definitions for certain that I've seen before include "Absolutely sure" , "Unquestionable" , "Proved beyond doubt" , "Indisputable" , "Quite sure, positive" .)