Related Clues:
- Essence (sometimes hard)
- Abs' muscle group
- 17-Across + 18-Across = 19-Across
- Apple part you don't want
- K) Middle of an apple
- Earth's central part
- Boring sample comprising carbon and rock
- Pineapple's center
- Central muscle group
- Apple's midsection
- What planks strengthen
- Honeycrisp center
- All that's left of a spent apple