Scattered about again, US lizards (7)

I believe the answer is:

iguanas

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

'lizards' is the definition.
(iguana is a kind of lizard)

'scattered about again us' is the wordplay.
'again us' anagrams to 'IGUANAS'.
But, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for iguanas that I've seen before include "beasts" , "Asia gun (anag.)" , "Tropical tree lizards" , "tropical natives" , "Monitors" .)

I've seen this clue in the Sydney Morning Herald.

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