Faulty electrics on VW Golf?

[Tom]

Hello
I have a Mk 4 Golf. Recently when i turn the engine on a clicking sound comes from the dash.
If i flick the lights on they will start to flicker every time it clicks. Occasionally when I indicate my radio will cut out. It comes and goes but seems to be getting more frequent.
Could this be the alternator?

Thanks for any answers.
Tom