a Mr. A. G. Sinclair

[ZigZ4g]

Hello everyone

I don't understand the usage of 'a' before the proper noun in this sentence. Would you help please?

Read the following information about a Mr. A.G Sinclair. Rearrange the sentences so that they appear in chronological order.

 

[Rover_KE]

Re: indefinite article

It means 'a man called'.

The writer is implying that he's never heard of the Sinclair guy before.