1 across: Retro Rotten fan clasps date at party (5-2)
This one’s gold because it combines an informal expression that someone in polite society might have said seemingly eons ago with the Sex Pistols.
This one’s confusion because I have no idea why ees = date given that Rotten fan = punk, retro Rotten fan = knup and party = knees-up.
I’m pretty sure DA is using “see” in the sense of “to be seeing someone” = to “date”, the “retro” indicator applying to the whole clue.
I had no idea how this clue worked before I saw this post, so thanks!