What may follow tequila — prison (7)

I believe the answer is:

slammer

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'prison' is the definition.
(I know that slammer is a type of prison)

I cannot understand how the remainder of the clue works.

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(Other definitions for slammer that I've seen before include "One pulling off lots of tricks" , "cocktail?" , "Prison (sl.)" , "I must be drunk in one" , "One criticising, as it were" .)

I've seen this clue in The Times.

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