Across
 1 Northwest European country (4)
 3 Town in Lincolnshire (8)
 8 Renown (4)
 9 Item for DIY assembly (4-4)
 11 Idea (maybe leading to baby) (10)
 14 (Building for) the movies (6)
 15 City of 1 across (6)
 17 Inappropriately worshipful (10)
 20 City of 1 across (8)
 21 See 23
 22 Political party in 1 across (4,4)
 23,21 Contest on the Thames (4,4)

Down
 1 Ability to produce required result (8)
 2 Beast that chews the cud (8)
 4 Tell (6)
 5 Quite good (after housework?) (3,2,5)
 6 Cure (4)
 7,13 Keep the wolf from the door? (4,4,4)
 10 Admire grub (anag) — having large mainsail with no gaff (7,3)
 12 The golden land? (8)
 13 See 7
 16 Trite phrase (6)
 18 Indicator of pitch (4)
 19 Portent (4)

Answers to previous puzzle