Crossword Genius

How to spill rum with a murmur (5)

Ross

I believe the answer is:

twice

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

'how' is the definition.
Both the definition and answer are adverbs. Perhaps they are linked in a way I don't understand?

'spill rum with a murmur' is the wordplay.
I cannot quite understand how this works, but
'with' could be 'w' (abbreviation) and 'w' is found within the answer.
The remaining letters 'tice' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'to' is the link.

Can you help me to learn more?

(Other definitions for twice that I've seen before include "Two times" , "Doubly" , "You only live -- (film)" , "Double in quantity" .)

I've seen this clue in the Evening Standard.
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