24 – entertaining TV show returning with Bauer essentially really old (7)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

for the surface, 24 [wiki] is the name of a TV show with Jack Bauer as the central character ANTE (solution to clue "24" down), around (entertaining): QI ="TV show" [wiki] reversed (returning), plus [Ba-] U [-er] ("essentially" indicating central letter)