Crossword Genius

Threesome breaking novice's heart (4)

Ross

I believe the answer is:

trio

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This could be a double definition.

'threesome' is the first definition.
(both can mean a group of three)

'breaking novice's heart' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

Can you help me to learn more?

(Other definitions for trio that I've seen before include "Riot (anag)" , "Ensemble musical piece, eg Beethoven's 'Archduke'" , "wise men?" , "Beethoven's 'Archduke', for example" , "Beethoven's 'Archduke': famous piece written for this ensemble" .)

I've seen this clue in The Independent.
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