Puzzling stuff with Conserving Canvas

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Across
  1. 5. Unsure royal horse with a yellowish or tan coat with primitive markings, also slang for not knowing (two words)
  2. 6. P + (anthony - nthony) + ul
  3. 7. Is Lynne picking up the Beach Boys vibes? (two words)
  4. 8. Flexing the painting's muscles
  5. 11. A popular worktop (two words)
  6. 12. Sticking together (not another Brexit joke;)
Down
  1. 1. Sucked out airmail (two words)
  2. 2. Discovering how a stretcher works (two words)
  3. 3. Always tackling the problems we are facing with positive support (two words)
  4. 4. Magical reptile that Rachel loves
  5. 9. Name of royal do(r)g(i) that possibly almost bit Juri, a real jaw breaker
  6. 10. A product based on EVA co-polymers, Laropal K80, Cellolyn 21 and paraffin wax