Crossword Genius

One left right out? (5)

Ross

I believe the answer is:

loner

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'one left right out?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'one left right out?' is the wordplay.
'left' becomes 'l' (common abbreviation).
'right' becomes 'r' (common abbreviation).
'out?' indicates putting letters inside.
'l'+'r'='lr'
'one' placed inside 'lr' is 'LONER'.

Can you help me to learn more?

(Other definitions for loner that I've seen before include "Individualist" , "One not desiring companionship" , "One lacking friends" , "No mixer" , "Isolated person" .)

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