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 am not certain of the 'apparently very filling' bit.

I don't understand the remainder of the clue.

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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