...although after victory, overlooks what a seafarer potentially does (6)
I believe the answer is:
vomits
'does' is the definition.
The definition and answer can be both related to bodily activities as well as being verbs in their -s form.
Perhaps they are linked in a way I don't understand?
'although after victory overlooks what a seafarer potentially' is the wordplay.
I cannot really see how this works, but
'victory' could be 'v' and 'v' is found within the answer.
'overlooks' could be 'omits' ('omit' can be a synonym of 'overlook') and 'omits' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for vomits that I've seen is " Ejects matter from mouth, being sick".)