Crossword Genius

Pity husband's deserted stag party? (3)

Ross

I believe the answer is:

rut

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This clue might be a double definition.

'pity husband's' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'deserted stag party?' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

Can you help me to learn more?

(Other definitions for rut that I've seen before include "Deep track worn into path" , "Monotonous routine that's hard to escape" , "Tedious procedure" , "Kind of groove or fixed habit" , "Deep track or tedious way of life" .)

I've seen this clue in The Times.
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