Fish isn't swimming, ashen in Florida? (8)

I believe the answer is:

stingray

I'm a little stuck... Click here to teach me more about this clue!

'fish' is the definition.
(I know that stingray is a type of ray)

'isn't swimming ashen in florida?' is the wordplay.
'swimming' is an anagram indicator.
'ashen in florida?' becomes 'gray' (I can't justify this - if you can you should believe this answer much more).
'isnt' anagrammed gives 'stin'.
'stin'+'gray'='STINGRAY'

Can you help me to learn more?

(Other definitions for stingray that I've seen before include "Large venomous fish -- it's angry (anag)" , "menace in the water" , "swimmer" , "Fish with venomous tail" , "TV show" .)

I've seen this clue in The Telegraph.

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