Yep, just push the little button in and hold it. The clock will start moving and just stop when it's correct. I have a 'stiff' wire twist tie that I keep in the console just for this. Using a bread tie as a 'special tool ' is very 'Lotus' as it is almost to flimsy to work but just does.
And if the hole in the glass does not match up with the hole in the clock face you should be able to turn the glass to get it to align.
Funny thing, when I got my 1997 there was a blanking plate where the clock is supposed to be. Figured my car hadn't gotten some optional gauge or something. Anyway, I was working on some other 'non-working' Lotus bits once and had the unfortunate task of removing the binnacle. Once I got it apart, guess what I found rolling around inside? Yep, the clock!!!! Didn't ever think it was still functional, but it was. The PO tried to tighten the bracket to tight and pulled the clock from the bezel and instead of repairing it they just left inside and put a blank cover in the hole.
I put it all back together with a little superglue and mounted it back in. Once I figured out how to set the time it has been one of the things on the car that actually works!!!