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Securely enclosed marine mammal with talking horse (6)

Ross

I believe the answer is:

sealed

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

'securely enclosed' is the definition.
The definition and answer can be both to do with contact as well as being past participle verbs.
Perhaps there's an association between them I don't understand?

'marine mammal with talking horse' is the wordplay.
'marine mammal' becomes 'seal' (I've seen this in another clue).
'with talking horse' becomes 'ed' (I am not sure about this - if you are sure you should believe this answer much more).
'seal'+'ed'='SEALED'

Can you help me to learn more?

(Other definitions for sealed that I've seen before include "Stamped as authentic" , "Airtight" , "Closed (of lips, envelope, tomb etc)" , "Fastened as in S.W.A.L.K." , "Securely closed" .)

I've seen this clue in the Sydney Morning Herald.
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