Simple life at sea, with recreational vehicle in coastal area abroad (7)
I believe the answer is:
algarve
'coastal area abroad' is the definition.
(coastal area of Portugal)
'simple life at sea with recreational vehicle' is the wordplay.
'simple life at sea' becomes 'algae' (algae are aquatic plants).
'with' is an insertion indicator.
'recreational vehicle' becomes 'RV' (abbreviation).
'algae' enclosing 'rv' is 'ALGARVE'.
'in' is the link.
(Other definitions for algarve that I've seen before include "coastal province" , "Atlantic tourist area" , "Area of Portugal popular with holidaymakers" , "Holiday area" , "Area of southern Portugal" .)