Conveys object on board steamship (5)
I believe the answer is:
sends
'conveys' is the definition.
(sending is a kind of conveying)
'object on board steamship' is the wordplay.
'object' becomes 'end' (I've seen this in other clues**).
'on board' means one lot of letters goes inside another.
'steamship' becomes 'ss'.
'end' placed into 'ss' is 'SENDS'.
(Other definitions for sends that I've seen before include "Despatches" , "Causes to go somewhere" , "Transmits" .)