Dogs spoilt garden seat (5,5)
I believe the answer is:
great danes
'dogs' is the definition.
(Great Dane is an example)
'spoilt garden seat' is the wordplay.
'spoilt' indicates anagramming the letters.
'garden'+'seat'='gardenseat'
'gardenseat' anagrammed gives 'GREAT DANES'.
(Other definitions for great danes that I've seen before include "Large dogs" , "Animals" , "big 6 downs [PET]" , "Pets" .)