Break out during the rupture (5)

I believe the answer is:

erupt

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

'during the rupture' is the wordplay.
'during' indicates a hidden word.
'ERUPT' can be found hidden inside 'the rupture'.

(Other definitions for erupt that I've seen before include "Break through (as a volcano)" , "Suddenly appear" , "Blow up like volcano" , "go up" , "Break out suddenly and violently" .)

I've seen this clue in The Mirror.

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