This crossword No. 511 clues and answers were published on Sun 26 Jun 2005 and the puzzle can be visited by following The Guardian Speedy Crossword No. 511 link.
All Across Clues and Answers:
1-across – Lose impetus : RUNOUTOFSTEAM
8-across – Nymph whose love Narcissus spurned : ECHO
9-across – Excessive use of words : VERBIAGE
10-across – Prime cut of pork, etc : TENDERLOIN
12-across – Docking facility for pleasure craft : MARINA
14-across – In golf, one under par for a hole : BIRDIE
15-across – WW1 chemical weapon : MUSTARDGAS
19-across – Occurring twice a year : BIANNUAL
20-across – Elects : OPTS
21-across – Spoil an opportunity : QUEERTHEPITCH
All Down Clues and Answers:
2-down – Clue’s man? : UNCLESAM
3-down – Egg-shaped : OVOID
4-down – Greek bar/restaurant : TAVERNA
5-down – Abjure : FORGO
6-down – More runny : THINNER
7-down – Transport to find the Golden Fleece : ARGO
11-down – Morally instructive : DIDACTIC
13-down – Vast : IMMENSE
14-down – Louis ——-, inventor of an aid to the blind : BRAILLE
16-down – Crouch down : SQUAT
17-down – Indian loincloth : DHOTI
18-down – Stead : LIEU
This crossword has in total 22 where 10 are across and 12 are down.