Release one barge back on the ocean (8)
I believe the answer is:
maritime
'on the ocean' is the definition.
I can't tell whether this definition defines the answer.
'release one barge back' is the wordplay.
'release' becomes 'emit' (to emit is to release or let out).
'one' becomes 'i' (Roman numeral).
'barge' becomes 'ram' (I've seen this before).
'back' shows that the letters should be reversed in order.
'emit'+'i'+'ram'='emitiram'
'emitiram' in reverse letter order is 'MARITIME'.
Can you help me to learn more?
(Other definitions for maritime that I've seen before include "Found near the sea" , "Naval" , "Of seafaring or shipping" , "Connected to the sea and sea-faring" , "beside the sea" .)