Fleas can fly? Untrue (5)

I believe the answer is:

false

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

'untrue' is the definition.
('false' can be similar in meaning to 'untrue')

'fleas can' is the wordplay.
'can' indicates an anagram (I've seen 'canned' mean this (canned can mean drunk)).
'fleas' with letters rearranged gives 'FALSE'.

'fly?' is the link.
This may not be correct. It may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for false that I've seen before include "Untrue - treacherous - counterfeit" , "Misleading" , "Incorrect" , "Spurious, untrue" , "Forged" .)

I've seen this clue in The Mirror.

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