This crossword No. 15509 clues and answers were published on Wed 22 Jan 2020 and the puzzle can be visited by following The Guardian Quick Crossword No. 15509 link.
All Across Clues and Answers:
1-across – Finished completely and for ever : DEADANDBURIED
8-across – Nought : ZERO
9-across – Maligned : VILIFIED
10-across – Structure hanging from the roof of a cave : STALACTITE
12-across – Baker Street detective : HOLMES
14-across – Rudiments : BASICS
15-across – Bad dreams : NIGHTMARES
19-across – Have the idea for : CONCEIVE
20-across – Publicise — stop : PLUG
21-across – Able to make plants grow well : GREENFINGERED
All Down Clues and Answers:
2-down – Subatomic particle — enrol etc : ELECTRON
3-down – Salivate : DROOL
4-down – Beginners : NOVICES
5-down – Spicy Pakistani cuisine with food cooked in a karahi : BALTI
6-down – Roof beams : RAFTERS
7-down – Ophthalmologist’s speciality : EYES
11-down – Timetable : SCHEDULE
13-down – Eyeglass : MONOCLE
14-down – Bird that booms : BITTERN
16-down – Intense sorrow : GRIEF
17-down – Copious : AMPLE
18-down – South African of Dutch ancestry : BOER
This crossword has in total 22 where 10 are across and 12 are down.