Pet dashed around a mother's boat (9)
I believe the answer is:
catamaran
'boat' is the definition.
(I know that catamaran is a type of boat)
'pet dashed around a mother's' is the wordplay.
'pet' becomes 'cat' (cats are often kept as pets).
'dashed' becomes 'ran' (I've seen this in another clue).
'around' indicates putting letters inside.
'mother' becomes 'ma' (Ma is another word for mother or mum).
'cat'+'ran'='catran'
'a'+'ma'='ama'
'catran' enclosing 'ama' is 'CATAMARAN'.
(Other definitions for catamaran that I've seen before include "Quarrelsome woman" , "One vessel" , "Twin-hulled craft" , "Twin-hulled sailing boat" , "Twin-hulled vessel" .)