Sail erratically around the kingdom with a dog (6)
I believe the answer is:
saluki
'dog' is the definition.
(Saluki is an example)
'sail erratically around the kingdom' is the wordplay.
'erratically' is an anagram indicator.
'around' is an insertion indicator.
'the kingdom' becomes 'UK' (UK is an example).
'sail' anagrammed gives 'sali'.
'sali' placed around 'uk' is 'SALUKI'.
'with a' acts as a link.
(Other definitions for saluki that I've seen before include "Tall hunting dog (like a greyhound) from Egypt and south-western Asia" , "Gazelle hound" , "5 [MANS BEST FRIEND]" , "Gazelle-hound" , "Tall breed of hound" .)