Phone has place to rest in caravan (6,4)
I believe the answer is:
mobile home
'caravan' is the definition.
(I've seen this before)
'phone has place to rest' is the wordplay.
'phone' becomes 'mobile phone' (mobile phone).
'has' means one lot of letters go next to another.
'place to rest' becomes 'home' (you can rest at home).
'mobile'+'home'='MOBILE HOME'
'in' acts as a link.
(Other definitions for mobile home that I've seen before include "House on wheels?" , "Permanently-used caravan" , "Large caravan for permanent residence" , "Caravan maybe" .)