This crossword No. 10167 clues and answers were published on Wed 04 Dec 2002 and the puzzle can be visited by following The Guardian Quick Crossword No. 10167 link.
All Across Clues and Answers:
5-across – Kind of vane : WEATHERCOCK
7-across – Boast : BRAG
8-across – Daughter of a monarch : PRINCESS
9-across – Stifle : SMOTHER
11-across – Delight in : ENJOY
13-across – Move furtively : SNEAK
14-across – Last line of a US address on an envelope : ZIPCODE
16-across – British prime minister throughout the 1980s : THATCHER
17-across – One of four offspring at the same birth : QUAD
18-across – Virtual dead heat in a horse race : PHOTOFINISH
All Down Clues and Answers:
1-down – Positive element of Chinese philosophy : YANG
2-down – Huge lie? : WHOPPER
3-down – Intellect : BRAIN
4-down – Relating to mountains such as Vesuvius : VOLCANIC
5-down – Skill of a craftsman : WORKMANSHIP
6-down – Act that has fatal or disastrous consequences : KISSOFDEATH
10-down – Use of weights and pulleys to heal a fracture : TRACTION
12-down – Attack by hostile aircraft : AIRRAID
15-down – Plant with clusters of white, red or purple flowers : PHLOX
17-down – Witty remark : QUIP
This crossword has in total 20 where 10 are across and 10 are down.