Times Cryptic No 28697 — One to chew on

This was a toughie, for sure, although at the beginning I was terribly distracted by goings-on with children and bedtime, so I didn’t get any flow.  Somewhere around the 15–20 minute mark, my brain clicked on and I could pick up steam, but towards the end things ground to a halt again. By the end, I had too much head-scratching to submit, yet all was correct in a hair under 56 minutes.