People have listed various tools they use in constructing puzzles. I thought I'd mention one that I don't think I've seen mentioned here: the BYU corpora, which I use to find collocates of a word (or phrase).
I got it by working backwards, actually. Figured, yeah, he's right, you need victory or winning, but what else do you need for the trophy? Ah, silver is 6 letters. Is there a football team called the revs? Time to Google…
CCCC: It was discovered in Iceland, some distance down from a G-man's hideout (5)
@oAlt Haha, I would be interested to know who else worked it out as it went along :) This series was meant just to be a lighter one than some of my more involved ones of late (the Premier League winners series comes to mind...) and I was interested to see how long it would go unspotted. It gets harder to sneak things past you all now you know to look for it! :)