Bono wrote that song when he was actually meeting with a friend, but Bono came too late (as usual ) and his friend left a note on the table in the restaurant reading "11 O'Clock Tick Tock". So, that's the thing about the title...gonna read the lyrics again and maybe I can help you with the lyrics.
******Okay, so here it is:
I read the lyrics and I always interpreted them as the emotions of the band before a gig
It's cold outside
It gets so hot in here
And the boys and girls collide
To The music in my ear
and a mix with the spiritual site if Bono
Call out your name
Call out in shame
Call out your name
Call out
You better call out
Call, call, call out.
He used to mix up almost everything with religion at this stage of early U2.