A male animal finally loaded on ship (6)
I believe the answer is:
aboard
'on ship' is the definition.
(I've seen this before)
'a male animal finally loaded' is the wordplay.
'male animal' becomes 'boar' (male pig).
'finally' says to take the final letters.
The last letter of 'loaded' is 'd'.
'a'+'boar'+'d'='ABOARD'
(Other definitions for aboard that I've seen before include "A poet penning nothing on vessel" , "Alongside" , "Embarked on (a ship)" , "Part of the group" , "On a ship, train, plane or other vehicle" .)