This crossword No. 15161 clues and answers were published on Mon 10 Dec 2018 and the puzzle can be visited by following The Guardian Quick Crossword No. 15161 link.
All Across Clues and Answers:
1-across – Technical researcher : BOFFIN
4-across – No longer open : CLOSED
9-across – Resolute in the face of pain — austere : SPARTAN
10-across – Land attached to a parish church : GLEBE
11-across – Punctuation mark : COLON
12-across – Presume — rue miss : SURMISE
13-across – Uninvited guest : GATECRASHER
18-across – Disconcerted : RATTLED
20-across – Burst open : SPLIT
22-across – System of religious principles : CREED
23-across – Put on a pedestal : ELEVATE
24-across – Impressionist painter of British nationality, d. 1899 : SISLEY
25-across – Plato’s birthplace : ATHENS
All Down Clues and Answers:
1-down – Essential principles : BASICS
2-down – Weak and delicate : FRAIL
3-down – Deeply emotional : INTENSE
5-down – German pistol : LUGER
6-down – Incapable of reproducing : STERILE
7-down – Make stronger : DEEPEN
8-down – Filled with a feeling of dread : ANGSTRIDDEN
14-down – Stag’s crowning glory : ANTLERS
15-down – Have qualms about : SUSPECT
16-down – Spring-flowering plant : CROCUS
17-down – Emotional tension : STRESS
19-down – Long-handled spoon : LADLE
21-down – Rent — easel : LEASE
This crossword has in total 26 where 13 are across and 13 are down.