Crossword Genius

Unusually a pretty cold old reptile (11)

Ross

I believe the answer is:

pterodactyl

'old reptile' is the definition.

'unusually a pretty cold' is the wordplay.
'unusually' is an anagram indicator.
'a'+'pretty'+'cold'='aprettycold'
'aprettycold' with letters rearranged gives 'PTERODACTYL'.

(Other definitions for pterodactyl that I've seen before include "Winged reptile of old" , "Late Jurassic flyer" , "Fossil flyer" , "Extinct flying reptile - protect lady (anag)" , "Flying creature" .)

I've seen this clue in The Telegraph.
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