Dog in Yorkshire river with tangled lead (8)
I believe the answer is:
airedale
'dog' is the definition.
(Airedale is an example)
'yorkshire river with tangled lead' is the wordplay.
'yorkshire river' becomes 'aire' (river in Yorkshire).
'with' means one lot of letters go next to another.
'tangled' indicates an anagram.
'lead' is an anagram of 'dale'.
'aire'+'dale'='AIREDALE'
'in' acts as a link.
(Other definitions for airedale that I've seen before include "Thematic type [DOG]" , "Yorkshire district; breed of terrier" , "best friend?" , "A leader I turn into a large breed of dog" , "Yorkshire valley" .)