Extinct reptile is around in changed form (8)

I believe the answer is:

dinosaur

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

'extinct reptile' is the definition.
(I've seen this before)

'is around in changed form' is the wordplay.
'is around' anagrams to 'DINOSAUR'.
But, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for dinosaur that I've seen before include "Extinct beast" , "Settle under canvas" , "Extinct reptilian animal" , "Enormous extinct reptile of ancient times" , "square figure!" .)

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