Coffee Break Cryptic

19 June

Across

1 Something lucky in grandma's cottage (6)
4 Work for the party (6)
8 Expert in posh car, no slouch (5)
9 Threats can seem frightful (7)
10 Overheard, retailer is more repulsive (7)
11 Revolvers smuggled in somewhere else (5)
12 What agents do about gift (9)
17 Home of old duke in Lincoln (5)
19 Reckoning for a city nobleman (7)
21 Port newly built alongside railway (7)
22 Question that baffles model (5)
23 Relatives might make scene about one (6)
24 Holiday distress signal (6)

Down

1 Illusory sight of silver buried in mud (6)
2 Help mug to be heard (7)
3 Frightening people consequently turning on head of security (5)
5 Article changing entire racecourse (7)
6 Formerly outside university when expected (2,3)
7 Sister prepared for combat (6)
9 Hired soldier happy to hold broken cane (9)
13 Take it - it could be supreme (7)
14 Faith, we hear, is tied up (7)
15 Churchman has time in Swiss community (6)
16 Tempestuous tale entertaining millions (6)
18 Hardy dog not needing lead (5)
20 Policeman and soldiers discover source of oil (5)