Story about fish close to ocean (4)
I believe the answer is:
yarn
'story' is the definition.
(synonyms)
'about fish close to ocean' is the wordplay.
'about' shows that the letters should be reversed in order.
'fish' becomes 'ray' (ray is a kind of fish).
'close to' indicates one should take the final letters (the close of something is the end).
The final letter of 'ocean' is 'n'.
'ray' reversed gives 'yar'.
'yar'+'n'='YARN'
(Other definitions for yarn that I've seen before include "Cord of twisted fibres, wool say" , "Fabricated" , "Sort of tale" , "Rambling story" , "A long tale" .)