Dashing to get a drink before the band (7)
I believe the answer is:
tearing
'dashing' is the definition.
(both can mean rushing around)
'a drink before the band' is the wordplay.
'a drink' becomes 'tea' (tea is a drink).
'before' is a charade indicator (letters next to each other).
'the band' becomes 'ring' (a ring is a band of metal).
'tea'+'ring'='TEARING'
'to get' acts as a link.
(Other definitions for tearing that I've seen before include "violent" , "splitting" , "Granite (anag.)" , "'Pulling apart, ripping (7)'" .)