Crossword Genius

Simpleton — one with a straw in his mouth? (6)

Ross

I believe the answer is:

sucker

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

'straw in his mouth?' is the definition.
'sucker' can be an answer for 'straw' (a straw is used to suck a drink). I am not certain of the 'in his mouth?' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for sucker that I've seen before include "Slangily, one who is easily deceived" , "Underground shoot from shrub, or slang victim" , "Slangy victim or plant shoot" , "Fool" , "Gullible person; plant shoot" .)

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