It's clear father needs temporary accommodation (6)
I believe the answer is:
patent
'it's clear' is the definition.
(synonyms)
'father needs temporary accommodation' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'needs' means one lot of letters go next to another.
'temporary accommodation' becomes 'tent' (people stay in a tent temporarily).
'pa'+'tent'='PATENT'
(Other definitions for patent that I've seen before include "Document granting an inventor sole rights to an invention" , "The right to an invention is clear" , "Manifest" , "Open the right to an invention" , "Licence for invention; obvious" .)