Just googled it:

http://www.loungeguide.net/wiki/u/Bo...Clipper_Lounge

Another review: this refers to Mumbai domestic;, So new it still smells of fresh paint, - nice cheap (£9) and more importantly cool business lounge (clipper lounge) upstairs but you've still got to pay for the wireless (oberoi airport services, about 50p an hour). Still, a good place to retreat to if you are waiting a long time between international and domestic flights. Like the four hours between connections I had last time!

Looks like you can get internet access for a small fee, but don't need to get into club to do so.