How do I solve 13 across in Daily Telegraph Cryptic 31247?

Question

Accepted Answer

13 across reads "Dog show with Winton, possibly on fourth of June" (8 letters); the answer is AIREDALE. 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.

Dog show with Winton, possibly on fourth of June (8)

13A — Dog show with Winton, possibly on fourth of June (8) — AIREDALE