Phone in caravan? (6,4)
I believe the answer is:
mobile home
'caravan?' is the definition.
(caravan is a kind of mobile home)
'phone in' is the wordplay.
'phone' becomes 'mobile phone' (mobile phone).
'in' becomes 'home' ('he's in' can mean 'he's home').
'mobile'+'home'='MOBILE HOME'
(Other definitions for mobile home that I've seen before include "Large caravan for permanent residence" , "House on wheels?" , "Caravan maybe" , "Permanently-used caravan" .)