Monster allegedly is seen at sea (6)

I believe the answer is:

nessie

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

'is seen at sea' is the wordplay.
'at sea' indicates an anagram.
'is'+'seen'='isseen'
'isseen' is an anagram of 'NESSIE'.

'allegedly' acts as a link.
This may not be correct. 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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