Sounds like setter will be located offshore (4)
I believe the answer is:
isle
'be located offshore' is the definition.
I can't tell whether this defines the answer.
'sounds like setter will' is the wordplay.
'sounds like' indicates a 'sounds like' (homophone) clue.
'setter will' becomes 'ill' (I'll, i.e. 'the person writing the crossword will').
'ill' sounds like 'ISLE'.
Can you help me to learn more?
(Other definitions for isle that I've seen before include "''There is an ..., a bonny ...'' (anthem of Shannon RFC)" , "being impossible without water" , "Geographic location" , "you can't walk away from" , "eg Thanet" .)