Expose twisted lead initially exasperating dog (8)
I believe the answer is:
airedale
'dog' is the definition.
(Airedale is an example)
'expose twisted lead initially exasperating' is the wordplay.
'expose' becomes 'air' (airing is a kind of exposing**).
'twisted' indicates an anagram.
'initially' indicates taking the first letters.
The initial letter of 'exasperating' is 'e'.
'lead' anagrammed gives 'edal'.
'air'+'edal'+'e'='AIREDALE'
(Other definitions for airedale that I've seen before include "River valley; rough-coated terrier" , "Terrier - Yorkshire area" , "Canine breed" , "Large breed of terrier" , "Dog taking" .)