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1 Across, Tips on code hacking - marks in rings in encrypted Morse, this could be X or Y (10)

9 Across, Unknown quantity say (not a Y) - it's added on (6)

10 Across, My reaction to horror film is heard - interval treat required? (3,5)

11 Across, No less than a collection of maps comprising Eastern Time (2,5)

Compiler - CROSOPHILE

Many Thanks

10 ice cream

9 annexe

11 at least

1a chromosome

Good morning to both of you and many thanks.