Solution No. 2617

Across

1 Part of the UK was invaded by the French (5)

4 Purchase, on the phone before work, a derivative (2-7)

9 Thorough? Off-target twice, apparently (3-3-3)

10 Treacherous type losing wife's support (5)

11 Fragment Marlene forced out of wealthy landowner, perhaps (9-6)

12 Storming start (5)

14 Tennis player, contemptible on passenger ship? (9)

16 Hope film director's put in new oratorio (4,2,3)

18 Hare off across middle of neutral ground (5)

19 Work for a pianist after the day job? (9,6)

21 Expresses mild disapproval in front of one Bantu tribe member (5)

22 Lourdes so relaxing being free from smell (9)

23 Tiny fish in good bowl, item used by cook (6,3)

24 Floral feature has tulip's head in centre of ring (5)

Down

1 Offender harassed dog owner on end of pier (9)

2 Tell principal of Loughborough College (3,2)

3 Sleeveless shirt - team's leader is after one (7)

4 Literary people blog Rob Roy, sum up novel (10,5)

5 Act firmly to gain momentum (3,4,4,4)

6 More than a couple of pounds altogether (7)

7 Constellation seen from Mars in our galaxy? (4,5)

8 Row about lodge's first doorkeeper (5)

13 Able to endure stormy weather was theory, unfortunately (9)

15 Tries during proper practice session (9)

17 Incredible bar in European capital (7)

18 Ecstasy obtained by tearaway, as a boost to self esteem? (3,4)

19 Second suitable upturned design (5)

20 Boy losing book causes alarm (5)

The solution to Crossword No. 2717 can be found on the left hand side.