I'll get this drink mixed with our spoon, say (5,4,6)

I believe the answer is:

whats your poison

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'i'll get this drink' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'mixed with our spoon say' is the wordplay.
'mixed' is an anagram indicator.
'with'+'our'+'spoon'+'say'='withourspoonsay'
'withourspoonsay' with letters rearranged gives 'WHATS YOUR POISON'.

Can you help me to learn more?

(Other definitions for whats your poison that I've seen before include "Local offer" , "A question that may be asked at the bar" .)

I've seen this clue in The Telegraph.

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