This crossword No. 9681 clues and answers were published on Mon 14 May 2001 and the puzzle can be visited by following The Guardian Quick Crossword No. 9681 link.
All Across Clues and Answers:
5-across – Gazebo : SUMMERHOUSE
7-across – Farm 4 down : BARN
8-across – Something opened by a key – stalemate : DEADLOCK
9-across – Government departments – where they sell tickets : OFFICES
11-across – Device for separating lumps : SIEVE
13-across – Thin sheet, as of glass : PLATE
14-across – Bundles of twigs for fuel : FAGGOTS
16-across – It joins roof apex and tie beam : KINGPOST
17-across – Shore for 4 down : PROP
18-across – Military detention centres : GLASSHOUSES
All Down Clues and Answers:
1-down – So be it! : AMEN
2-down – Plot where young plants develop : SEEDBED
3-down – Bundle, as of reeds for thatching : SHEAF
4-down – Erection : BUILDING
5-down – Metal framework used when 4 down : SCAFFOLDING
6-down – Holes made by digging : EXCAVATIONS
10-down – Formed of constituent parts : INTEGRAL
12-down – Fortified place : BASTION
15-down – Device for lifting, often attached to 5 down : HOIST
17-down – Upright length of wood or metal ã permanent military establishment : POST
This crossword has in total 20 where 10 are across and 10 are down.