Lover moves to a marina (9)
I believe the answer is:
inamorata
'lover' is the definition.
(I know that inamorata is a type of lover)
'moves to a marina' is the wordplay.
'moves' indicates an anagram.
'to'+'a'+'marina'='toamarina'
'toamarina' with letters rearranged gives 'INAMORATA'.
(Other definitions for inamorata that I've seen before include "6 across [BOSOM] friend" , "Woman in love" , "Female lover" , "A woman loved" , "Sweetheart" .)