This crossword No. 9562 clues and answers were published on Sat 23 Dec 2000 and the puzzle can be visited by following The Guardian Quick Crossword No. 9562 link.
All Across Clues and Answers:
1-across – Marine animal with globular body : SEAURCHIN
8-across – Acting part : ROLE
9-across – Diligent : ASSIDUOUS
10-across – Undershirt : VEST
13-across – Twist : SCREW
15-across – Add to and improve : ENRICH
16-across – Peril : DANGER
17-across – Highly seasoned stew : RAGOUT
19-across – Disclose : REVEAL
20-across – Happen again : RECUR
21-across – Corpse : BODY
24-across – Offensively self-assertive : BUMPTIOUS
25-across – Watched : EYED
26-across – Sailors’ song : SEASHANTY
All Down Clues and Answers:
2-down – Otherwise : ELSE
3-down – Whole – group : UNIT
4-down – Grasp : CLUTCH
5-down – Accustomed : INURED
6-down – Alien : FOREIGNER
7-down – Steal true : SEATURTLE
11-down – Pirate : SEAROBBER
12-down – High-ranking army officer : BRIGADIER
13-down – Scrub : SCOUR
14-down – Irrigate : WATER
18-down – Holding of office : TENURE
19-down – Disturbance : RUMPUS
22-down – Capital of Peru : LIMA
23-down – Barely – fair : JUST
This crossword has in total 28 where 14 are across and 14 are down.