Send me a neat marine creature (7)
I believe the answer is:
manatee
'marine creature' is the definition.
The definition and answer can be both animals as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'send me a neat' is the wordplay.
'send' indicates anagramming the letters (I've seen 'sends' mean this (send can mean excite or stir)).
'me'+'a'+'neat'='meaneat'
'meaneat' is an anagram of 'MANATEE'.
Can you help me to learn more?
(Other definitions for manatee that I've seen before include "Large swimmer" , "Beast" , "Sea cow - emanate (anag)" , "sea creature appears" , "rare sea mammal" .)