Sailor from Arab country returns with adult girlfriend (9)
I believe the answer is:
inamorata
'girlfriend' is the definition.
(an inamorata is a lover)
'sailor from arab country returns with adult' is the wordplay.
'sailor' becomes 'tar' (slang term for a sailor).
'from arab country' becomes 'Omani' (from Oman).
'returns' shows that the letters should be reversed in order.
'with' means one lot of letters go next to another.
'adult' becomes 'a' (abbreviation).
'tar'+'omani'='taromani'
'taromani' back-to-front is 'inamorat'.
'inamorat'+'a'='INAMORATA'
(Other definitions for inamorata that I've seen before include "Sweetheart" , "Girlfriend" , "loved one" , "Woman in love" , "Female lover" .)