Crossword Genius

A weird bunch in Shakespeare play — or one by Chekhov? (3,5,7)

Ross

I believe the answer is:

the three sisters

I'm a little stuck... Click here to teach me more about this clue!

'a weird bunch in shakespeare play' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'one by chekhov?' is the wordplay.
I cannot really understand how this works, but
'one' could be 'the' (both can introduce a definite example of something) and 'the' is located in the answer.
The remaining letters 'threesisters' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'or' is the link.

Can you help me to learn more?

(Other definitions for the three sisters that I've seen before include "Chekhov's" , "girls in treacle well" , "Graces?" , "Play" .)

I've seen this clue in The Times.
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