Across
1
Affectedly modest or shy (6)
4
Old World heath vegetation: sweeper (5)
7
Composed/arranged music for film or TV (6)
8
Evil-smelling; rank (variant spelling) (6)
9
Spasmodic and irregular bursts of activity (4,3,6)
11
Deprivation of office: utter poverty (11)
16
Open-air feature of a cruise ship (9,4)
18
Burst in using force (6)
Down
1
Ran down; disapproved of (7)
2
Catholic Society of Mary, founded in Lyon in 1816 for missionary works (7)
3
Flag flown by the British Merchant Navy (3,6)
5
Smallest of the Great Lakes (7)
6
Only mortal Gorgon sister (6)
10
Short, snappy radio or TV item, or edit thereof (5,4)
12
Voyage of self-indulgence (3,4)
13
Market, mathematical or computer indicators (7)
15
Transmission, or its path, from Earth to a spacecraft (6)
17
One who is voluntarily living and/or working in a foreign country (colloq) (5)