For sailor, fetch object (6)
I believe the answer is:
target
'object' is the definition.
(I know that object can be written as target)
'for sailor fetch' is the wordplay.
I cannot really understand how this works, but
'sailor' could be 'tar' (term for a sailor) and 'tar' is found in the answer.
'fetch' could be 'get' (synonyms) and 'get' is located in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for target that I've seen before include "Point to aim at (6)." , "Thing to aim at" , "Butt" , "Goal to be aimed for" , "Goal, objective" .)