Gather in the morning on a ship (5)
I believe the answer is:
amass
'gather in' is the definition.
'the morning on a ship' is the wordplay.
'the morning' becomes 'am'.
'on' means one lot of letters go next to another.
'ship' becomes 'ss'.
'am'+'a'+'ss'='AMASS'
(Other definitions for amass that I've seen before include "run up?" , "Sodium chloride" , "Stockpile" , "Put together" , "store" .)