This crossword No. 11521 clues and answers were published on Wed 11 Apr 2007 and the puzzle can be visited by following The Guardian Quick Crossword No. 11521 link.
All Across Clues and Answers:
5-across – Upset status quo : ROCKTHEBOAT
7-across – Encourage : ABET
8-across – Small folding pocket blade : PENKNIFE
9-across – Projectile : MISSILE
11-across – New and intriguing : NOVEL
13-across – Tiny spot : SPECK
14-across – Fish that can be red and kippered! : HERRING
16-across – Verse etc to aid memory : MNEMONIC
17-across – Broken – chest : BUST
18-across – Early keyboard instrument : HARPSICHORD
All Down Clues and Answers:
1-down – Type of jazz singing – be off! : SCAT
2-down – Use dots to draw, paint etc : STIPPLE
3-down – Deceptive movement designed to distract : FEINT
4-down – Heavy rain : DOWNPOUR
5-down – Blow to back of neck : RABBITPUNCH
6-down – Stuck-up : TOFFEENOSED
10-down – Tree producing propeller-shaped seeds : SYCAMORE
12-down – Bird noted for showy plumage : PEACOCK
15-down – General feeling of anxiety : ANGST
17-down – Pole for overhead microphone – deep sound : BOOM
This crossword has in total 20 where 10 are across and 10 are down.