Support finished in shipboard storage area (6)
I believe the answer is:
uphold
'support' is the definition.
(I know that uphold is a type of support)
'finished in shipboard storage area' is the wordplay.
I cannot quite see how this works, but
'finished' could be 'up' (eg 'time's up' means the time is finished) and 'up' is found within the answer.
'area' could be 'hold' (hold is a kind of area) and 'hold' is located 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?
(Other definitions for uphold that I've seen before include "Support, maintain" , "Champion" , "'Support, the law say (6)'" , "Support a decision or belief" , "Sustain and endorse" .)