Crossword Genius

Monster’s head, that is (6)

Ross

I believe the answer is:

nessie

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

'head that is' is the wordplay.
'head' becomes 'ness' (ness is a headland).
'that is' becomes 'ie' (abbreviation for id est, 'that is' in Latin).
'ness'+'ie'='NESSIE'

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

I've seen this clue in The Times.
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