Cured fish, apparently very filling (7)

I believe the answer is:

bloater

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

'fish apparently very filling' is the definition.
'bloater' can be an answer for 'fish' (I've seen this before). I'm unsure of the 'apparently very filling' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for bloater that I've seen before include "Buckling" , "food" , "Herring salted and smoked" , "Cured herring" , "Partially dried herring" .)

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