Crossword Genius

It tells guy to escape a vegetable (9)

Ross

I believe the answer is:

mangetout

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

'a vegetable' is the definition.
(I've seen this before)

'it tells guy to escape' is the wordplay.
I cannot really understand how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found within the answer.
'guy' could be 'man' (I've seen this before) and 'man' is present in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for mangetout that I've seen before include "Type of pea" , "something on the plate" , "Sugar peas" , "vegetables" , "Vegetable" .)

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