Modernised a dud pet, somehow (7)
I believe the answer is:
updated
'modernised' is the definition.
(I've seen this before)
'a dud pet somehow' is the wordplay.
'somehow' indicates an anagram.
'a'+'dud'+'pet'='adudpet'
'adudpet' anagrammed gives 'UPDATED'.
(Other definitions for updated that I've seen before include "Dude apt to be made current" , "Brought to current status" , "Made something more modern" , "revised" , "Modernised" .)