Sailor in strange place is efficient (7)
I believe the answer is:
capable
'efficient' is the definition.
(I've seen this before)
'sailor in strange place' is the wordplay.
'sailor' becomes 'ab' (abbreviation for able seaman).
'in' indicates putting letters inside.
'strange' is an anagram indicator.
'place' is an anagram of 'caple'.
'ab' put into 'caple' is 'CAPABLE'.
'is' is the link.
(Other definitions for capable that I've seen before include "accomplished" , "Efficient" , "Able, proficient" , "Able, competent" , "Adept" .)