Left a person with no company (4)

I believe the answer is:

lone

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

'person with no company' is the definition.
I can't tell whether this definition defines the answer.

'left a' is the wordplay.
'left' becomes 'l' (common abbreviation).
'a' becomes 'one'.
'l'+'one'='LONE'

Can you help me to learn more?

(Other definitions for lone that I've seen before include "Companionless" , "The ... Ranger, fictional masked cowboy" , "Single and isolated" , "Solitary, sounds like advance" , "Solitary or single" .)

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