British sailor recalled capital city (4)
I believe the answer is:
baku
'capital city' is the definition.
(capital of Azerbaijan)
'british sailor recalled' is the wordplay.
'british' becomes 'uk' (I've seen this in other clues).
'sailor' becomes 'ab' (abbreviation for able seaman).
'recalled' shows that the letters should be reversed in order.
'uk'+'ab'='ukab'
'ukab' written backwards gives 'BAKU'.
(Other definitions for baku that I've seen before include "Azerbaijan's capital" , "Capital city of Azerbaijan" , "Caspian Sea port" , "Capital of Azerbaijan on shore of Caspian Sea" .)