Clone Spell at Town Hall 10: max level 3. At Town Hall 18 the cap is level 9. It unlocks at Town Hall 10. Max level per Town Hall: TH10 3, TH11 5, TH12 5, TH13 6, TH14 7, TH15 8, TH16 8, TH17 8, TH18 9.
Tap a Town Hall to open this item there. Dashed: not available at that Town Hall yet.