Old woman in dam near barking dog (10)
I believe the answer is:
weimaraner
'dog' is the definition.
(Weimaraner is an example)
'old woman in dam near barking' is the wordplay.
'old woman' becomes 'ma' (I've seen this in other clues).
'in' means one lot of letters goes inside another.
'dam' becomes 'weir' (a weir is a type of dam).
'barking' is an anagram indicator (UK slang for mad).
'ma' inserted into 'weir' is 'weimar'.
'near' is an anagram of 'aner'.
'weimar'+'aner'='WEIMARANER'
(Other definitions for weimaraner that I've seen before include "Hunting dog" , "Breed of pointer" .)