Husband took off some time that's just for us (4)
I believe the answer is:
ours
'for us' is the definition.
(I've seen this before)
'husband took off some time' is the wordplay.
'husband' becomes 'h' (abbreviation).
'took off' suggests deleting specific letters.
'some time' becomes 'hours' (several hours).
'hours' with 'h' removed is 'OURS'.
'that's just' is the link.
(Other definitions for ours that I've seen before include "British" , "of the Queen?" , "Belong to us both" , "What we share" , "Yours and mine!" .)