Frus, you answered Cried's question (one of them at least). ;-) Here is another one: Twilight Zone.
But we're not done yet with mine. Hooks in You was not what I was looking for. The (co-)writer should play on the song.
What I find so special (and rare) is that the songs I'm asking for do have (a) solo(s) but the (co-)writing guitarist does not play the solo(s) himself! He gives (a) solo(s) to (an)other (people)! I don't think Adrian wrote Hooks in You without having in mind doing an own solo on it (as we can hear, there is room for two: Dave and himself). So I'll rephrase the original question:
On the Iron Maiden albums, there are only two songs (co-)written by a guitarist that feature (a) guitar solo(s), but not a solo by that particular guitarist (the (co-)writer in question) himself. Note: the (co-)writing guitarist plays on the song.
Who is this/are these guitarist(s) and which are the songs we're talking about?
1. Janick Gers co-wrote The Mercenary (Gers/Harris) and the solos are by Dave Murray and Adrian Smith.
2. ??? (co-)wrote ??? (???) and the solo(s) is/are by ???