That's because it's wrong- I was looking for a hidden word and chose adit because it was what I saw first, and it's connected to drainage so I thought it might come from the 'well' in the clue.
But also is much better
Thank you factor-fiction ,anserine is a new word to me . I don't understand adit as the answer to clue 21a . Thank you for Also .I hadn't scrolled down far enough
lorus