Crossword Genius

Monster is seen writhing (6)

Ross

I believe the answer is:

nessie

'monster' is the definition.
(Nessie is an example)

'is seen writhing' is the wordplay.
'writhing' is an anagram indicator.
'is'+'seen'='isseen'
'isseen' anagrammed gives 'NESSIE'.

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

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