Break out from slammer up town (5)

I believe the answer is:

erupt

'break out' is the definition.
(I know that break out can be written as erupt)

'from slammer up town' is the wordplay.
'from' indicates the answer is hidden within the clue.
'ERUPT' can be found hidden inside 'slammer up town'.

(Other definitions for erupt that I've seen before include "Explode" , "be active" , "Suddenly appear" , "What canines do" , "Break out suddenly and violently" .)

I've seen this clue in The Sun.

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