Equipped for half a year at sea? (5)
I believe the answer is:
armed
'equipped' is the definition.
(similar in meaning)
'half a year at sea?' is the wordplay.
'half a' suggests halving the letters.
'at' means one lot of letters go next to another.
'sea?' becomes 'med' (short for Mediterranean).
'year' with half the letters taken is 'ar'.
'ar'+'med'='ARMED'
'for' is the link.
(Other definitions for armed that I've seen before include "Prepared for attack" , "Equipped with weapons" , "Prepared and equipped for a confrontation" , "Having guns" , "equipped for fighting" .)