Dog set sail around UK! (6)
I believe the answer is:
Here is my best explanation:
'dog' is the definition.
(Saluki is an example)
'set sail around uk' is the subsidiary indication.
'set' is an anagram indicator (instruction to set the letters).
'around' means one lot of letters goes inside another.
'sail' with letters rearranged gives 'sali'.
'sali' enclosing 'uk' is 'saluki'.
(Other definitions for saluki that I've seen before include "Silky-coated dog", "Shown [AT CRUFTS]", "Persian greyhound", "Tall hunting dog (like a greyhound) from Egypt and south-western Asia", "Gazelle hound", "Tall slender dog", "Gazelle-hound", "Tall breed of hound", "Tall silky-coated dog" and "5 [MANS BEST FRIEND]".)