An underlying theme of this crossword is architecture, so several of the answers relate to this art.

CLUES
Across
1 Tears may result if you are hit by this (5)
4 Plant a collection of sports cars (7)
8 I’m no great-aunt creates a row (13)
9 Elsy sleeps, why not? (9)
11 Cunning is costly (3)
12 My measure is part tricky (6)
13 Flying buttress style (6)
16 A familiar father (3)
17 Home admin is argumentative (2,7)
18 15th and 16th century line (13)
20 He thirsts for these garments (1-6)
21 A rustic dialect (5)
Down
1 No trams need a cross-beam (7)
2 An opening for edge merchants (9,4)
3 A forceful memory (3)
4 This support may be part intelligent (6)
5 Mrs Rafton may change shape (9)
6 A retailer all at sea perhaps (5,8)
7 A familiar address for a junior (5)
10 A war-like representative no longer tense (9)
14 Descriptive of cloth is MacCrib (7)
15 Diffuse or direct light, he’s sad to do it (6)
16 He opted out of this establishment (5)
19 A fishy treaty without a car (3)

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