Crossword Genius

Not true fleas (5)

Ross

I believe the answer is:

false

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

'not true' is the definition.
(I know this)

'fleas' is the wordplay.
'fleas' can be anagrammed to 'FALSE'.
But, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for false that I've seen before include "Invalid; untrue" , "Forged" , "Wrong" , "Bogus" , "Artificial" .)

I've seen this clue in The Irish News.
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