Artificial fleas buzzing about (5)

I believe the answer is:

false

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

'artificial' is the definition.
(similar in meaning)

'fleas buzzing about' is the wordplay.
'fleas' anagrams to 'FALSE'.
Though, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for false that I've seen before include "Sham" , "Incorrect" , "Invalid; untrue" , "Fake; untrue" , "Untrue - treacherous - counterfeit" .)

I've seen this clue in The Sun.

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