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'They' is a third person singular pronoun. It has been in use to denote an singular individual of unknown gender for hundreds of years (since ~14th century).

"With an antecedent referring to an individual generically or indefinitely (e.g. someone, a person, the student), used esp. so as to make a general reference to such an individual without specifying gender"[0]

"Often used in reference to a singular noun made universal by every, any, no, etc., or applicable to one of either sex (= ‘he or she’)."[1]

[0] - https://www.oed.com/view/Entry/200700 - current OED entry

[1] - https://www.oed.com/oed2/00251026 - 2nd edition OED entry from 1989

[sam_bristow]

Funny how people who get wound up about singular 'they' don't have the same issues with singular 'you'.

[ibejoeb]

I would have exactly the same problem. When it is ambiguous, it needs to be clarified. It's easy to write it with clarity. What's the argument for not writing for clarity? This is the fourth time I'm asking, and yet none of the dispassionate, logical people here are willing to address it.