This crossword No. 9667 clues and answers were published on Fri 27 Apr 2001 and the puzzle can be visited by following The Guardian Quick Crossword No. 9667 link.
All Across Clues and Answers:
1-across – Person continually grumbling : GROUCH
4-across – Roam : WANDER
9-across – Formerly, the daughter of a Spanish king : INFANTA
10-across – Sponsorship : AEGIS
11-across – Ointment : SALVE
12-across – Swell : DISTEND
13-across – Newspapers seeking sensationalism in coverage : GUTTERPRESS
18-across – Sub-unit of a military company : PLATOON
20-across – Banquet : FEAST
22-across – Muse of love poetry : ERATO
23-across – Trouble : DISTURB
24-across – Lorry fuel : DIESEL
25-across – Dress : CLOTHE
All Down Clues and Answers:
1-down – Salmon on first return to fresh water : GRILSE
2-down – Refuse – edible entrails : OFFAL
3-down – Nunnery : CONVENT
5-down – Gather : AMASS
6-down – Go off the subject : DIGRESS
7-down – Live : RESIDE
8-down – Small explosive device used in close combat : HANDGRENADE
14-down – Not conscious : UNAWARE
15-down – Denial : REFUSAL
16-down – Scatter – padres : SPREAD
17-down – Firm – building for animals : STABLE
19-down – Bracing seaside air : OZONE
21-down – Grown-up : ADULT
This crossword has in total 26 where 13 are across and 13 are down.