Monster allegedly is seen at sea (6)

I believe the answer is:

nessie

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

'monster' is the definition.
(I know that Nessie is a legendary creature)

'is seen at sea' is the wordplay.
'at sea' indicates anagramming the letters.
'is'+'seen'='isseen'
'isseen' anagrammed gives 'NESSIE'.

'allegedly' acts as a link.
I am not very happy about this link. It may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for nessie that I've seen before include "Supposed loch monster" , "Scots loch monster (colloq.)" , "Nickname for a Scottish monster" .)

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