Wandering around is ancient reptile (8)

I believe the answer is:

dinosaur

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'ancient reptile' is the definition.
'dinosaur' can be an answer for 'reptile' (dinosaur is a kind of reptile). I am not certain of the 'ancient' bit.

'wandering around is' is the wordplay.
'wandering' indicates an anagram.
'around'+'is'='aroundis'
'aroundis' with letters rearranged gives 'DINOSAUR'.

Can you help me to learn more?

(Other definitions for dinosaur that I've seen before include "Huge prehistoric monster" , "Fogey" , "Extinct monster like Barney, children's TV pal" , "Out of date person or thing" , "Prehistoric monster from Jurassic era" .)

I've seen this clue in The Sun.

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