How do I solve 10 across in Times Cryptic 29533?

Question

Accepted Answer

10 across reads "Remove water from bottle to begin with and feel poorly" (4 letters); the answer is BAIL. 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.

Remove water from bottle to begin with and feel poorly (4)

10A — Remove water from bottle to begin with and feel poorly (4) — BAIL