Father's mobile home - it's obvious (6)
I believe the answer is:
patent
'obvious' is the definition.
(similar in meaning)
'father's mobile home' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'mobile home' becomes 'tent' (I've seen this in another clue).
'pa'+'tent'='PATENT'
'it's' acts as a link.
(Other definitions for patent that I've seen before include "Sole right to exploit an invention" , "Registration of ownership of invention" , "Obvious - protection for inventors" , "Licence for inventors; obvious" , "Obvious - property right to invention" .)