This insect can possibly escape (6)

I believe the answer is:

mayfly

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

'this insect' is the definition.
(mayfly is a kind of insect)

'can possibly escape' is the wordplay.
'can possibly' becomes 'may' (synonyms. I am not sure about the 'possibly' bit.).
'escape' becomes 'fly' (I've seen this in another clue).
'may'+'fly'='MAYFLY'

Can you help me to learn more?

(Other definitions for mayfly that I've seen before include "Short-lived spring insect" , "Ephemeral insect" , "Short-lived insect with delicate wings" .)

I've seen this clue in the Evening Standard.

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