Helper swam out to see sea creature (5,5)

I believe the answer is:

sperm whale

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'see sea creature' is the definition.
The definition and answer can be both animals as well as being singular nouns.
Maybe there's a link between them I don't understand?

'helper swam out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'helper'+'swam'='helperswam'
'helperswam' anagrammed gives 'SPERM-WHALE'.

'to' acts as a link.

Can you help me to learn more?

(Another definition for sperm whale that I've seen is " Marine mammal (cachalot)".)

I've seen this clue in The Telegraph.

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