Crossword Genius

Short measure of alcohol immediately after wedding (5)

Ross

I believe the answer is:

union

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'wedding' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for union that I've seen before include "A joining together as in marriage" , "workers' co-operative" , "Association - guild" , "Workers' group" , "Coalition" .)

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