Silly Uncle Pat I blame (9)
I believe the answer is:
inculpate
'blame' is the definition.
(I've seen this before)
'silly uncle pat i' is the wordplay.
'silly' indicates an anagram.
'uncle'+'pat'+'i'='unclepati'
'unclepati' with letters rearranged gives 'INCULPATE'.
(Other definitions for inculpate that I've seen before include "Incriminate" , "Blame" , "Accuse" .)