Knonist do you have rapid fire shifters ( little paddles you push with your thumb) or twist grip shifter (bit like the throttle on a motorbike)
on the shifters themselves where the cable enters it, you'll find a little turn screw (the cable should pass through this turn screw), you can turn this to make small adjustments to the front derailleur ... try anti-clockwise one full turn and check to see if the noise has gone, repeat this until it stops, remember one turn at a time.
I hope it helps
Norm