This crossword No. 13750 clues and answers were published on Wed 04 Jun 2014 and the puzzle can be visited by following The Guardian Quick Crossword No. 13750 link.
All Across Clues and Answers:
1-across – Marine invertebrate — enrich USA : SEAURCHIN
8-across – Derive by reasoning : INFER
9-across – City on the Clyde : GLASGOW
10-across – 5-4, 40-30, for example : SETPOINT
11-across – Succulent plant : ALOE
13-across – Small beetle with a long snout : WEEVIL
14-across – Bunch of ornamental threads : TASSEL
16-across – Person taking drugs : USER
17-across – Persistent follower : HANGERON
19-across – Study of animals : ZOOLOGY
20-across – Noddle : BONCE
21-across – Staying power : ENDURANCE
All Down Clues and Answers:
1-down – Scornfully mocking : SARDONIC
2-down – : ARGENT
3-down – 500 sheets, perhaps : REAM
4-down – Tense and easily upset : HIGHLYSTRUNG
5-down – Kiwi : NEWZEALANDER
6-down – Picture cut into interlocking pieces for reassembly : JIGSAWPUZZLE
7-down – Not for quotation : OFFTHERECORD
12-down – Bleating : TANGIBLE
15-down – Ravine formed by a river : CANYON
18-down – 3,600 seconds : HOUR
This crossword has in total 22 where 12 are across and 10 are down.