Sound from sailor in base (6)
I believe the answer is:
viable
'sound' is the definition.
(I've seen this before)
'sailor in base' is the wordplay.
'sailor' becomes 'ab' (abbreviation for able seaman).
'in' means one lot of letters goes inside another.
'base' becomes 'vile' (synonyms).
'ab' going into 'vile' is 'VIABLE'.
'from' is the link.
(Other definitions for viable that I've seen before include "reasonable hope of success" , "Capable of life and growth" , "Workable" , "Feasible" , "Possible and practical" .)