Absorbed in Batman, get out snack food (10)

I believe the answer is:

mangetouts

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'snack food' is the definition.
(vegetable eaten as a snack)

'absorbed in batman get out' is the wordplay.
'absorbed in' indicates putting letters inside.
'batman' becomes 'mans' (I can't justify this - if you can you should believe this answer much more).
'get'+'out'='getout'
'mans' placed around 'getout' is 'MANGETOUTS'.

Can you help me to learn more?

(Another definition for mangetouts that I've seen is " The Greens".)

I've seen this clue in The Telegraph.

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