The most common and most likely answer to this crossword clue is the 7 letter word WEDDING
I've seen this crossword clue in The Guardian
W
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D
D
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Buddy explains!

The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does WEDDING mean?
WEDDING verb- To perform the marriage ceremony for; to join in matrimony.
- To take as one's spouse.
- To take a spouse.
- To join or commit to, more or less permanently, as if in marriage.
- To take to oneself and support; to espouse.
- To wager, stake, bet, place a bet, make a wager.
- Marriage ceremony; ritual officially celebrating the beginning of a marriage.
- Joining of two or more parts.
- To participate in a wedding.