Crossword Genius

Half a doublet? (7)

Ross

I believe the answer is:

singlet

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This could be a double definition.

'half' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'a doublet?' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I can't see?

Can you help me to learn more?

(Other definitions for singlet that I've seen before include "Underwear" , "Tingles in vest" , "underclothing" , "Sleeveless shirt" , "One unaccompanied" .)

I've seen this clue in the Evening Standard.
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