How do I solve 22 down in Times Cryptic 29548?

Question

Accepted Answer

22 down reads "Odd selection in call up by the Barbarians?" (4 letters); the answer is CLUB. It's a letter-selection clue: take specific letters from a longer source. 'First of' means the opening letter, 'extremely' means first + last, 'regularly' means every other letter, 'oddly' / 'evenly' means odd or even positions. The full step-by-step breakdown is on this page.

Odd selection in call up by the Barbarians? (4)

22D — Odd selection in call up by the Barbarians? (4) — CLUB