Expert to welcome short snack in bar (8)

I believe the answer is:

prohibit

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

'snack in bar' is the definition.
'prohibit' can be an answer for 'bar' (I've seen this before). I am not certain of the 'snack in' bit.

'expert to welcome short' is the wordplay.
'expert' becomes 'pro' (I've seen this before).
'to welcome' becomes 'hi' (I've seen this in other clues).
'short' becomes 'bit'.
'pro'+'hi'+'bit'='PROHIBIT'

Can you help me to learn more?

(Other definitions for prohibit that I've seen before include "Stop" , "Ban; prevent" , "Proscribe, forbid" , "Forbid, ban" , "Disallow" .)

I've seen this clue in The Guardian.

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