Hi malone
I don't think that the word order works for your TUNER - the "on" is part of the definition (device on TV).
I also was baffled by Bernie's reference to a piano!
Thanks, folks. I didn't do very well with either of those clues! My excuse is that I looked at them quite casually while I waited for my dinner to be ready...a watched pot never boils.
Thanks, Bernie, because the parses of these two were troubling me, too. Took me a while for the penny to drop, especially the relevance of 'in two parts', but eventually ...