This crossword No. 13259 clues and answers were published on Tue 06 Nov 2012 and the puzzle can be visited by following The Guardian Quick Crossword No. 13259 link.
All Across Clues and Answers:
1-across – Cause to get stuck : MIRE
3-across – Branch of maths dealing with differentiation and integration : CALCULUS
8-across – Object : ITEM
9-across – Horses’ eyeshades? : BLINKERS
11-across – Irrefutable evidence : SMOKINGGUN
14-across – Drug with an opium base : OPIATE
15-across – Collection of star systems : GALAXY
17-across – Grossly unconventional : OFFTHEWALL
20-across – Plant with showy flowers — fax to lad : TOADFLAX
21-across – Kind of cat : MANX
22-across – Homeless feline : ALLEYCAT
23-across – Female opera star : DIVA
All Down Clues and Answers:
1-down – Leaflet sent to a large group at the same time : MAILSHOT
2-down – Bombast — speechcraft : RHETORIC
4-down – Aver — maintain : ALLEGE
5-down – : CONJUGATED
6-down – Art song — told porkies : LIED
7-down – Ribbon worn over the shoulder : SASH
10-down – Evenly divided : FIFTYFIFTY
12-down – Exotic Dutch dancer, executed by the French as a German, 1917 : MATAHARI
13-down – Word blindness : DYSLEXIA
16-down – Layers : STRATA
18-down – : STOA
19-down – Round object : BALL
This crossword has in total 24 where 12 are across and 12 are down.