More work? Extremely urgent work I advanced (6)
I believe the answer is:
utopia
'more work?' is the definition.
(work by Sir Thomas More)
'extremely urgent work i advanced' is the wordplay.
'extremely' says to hollow out the word (remove centre letters) (only the extremes of the word are used).
'work' becomes 'op' (common abbreviation for 'opus').
'advanced' becomes 'a' (abbreviation).
'urgent' with its centre taken out is 'ut'.
'ut'+'op'+'i'+'a'='UTOPIA'
(Other definitions for utopia that I've seen before include "Idealised place" , "Sir Thomas More's perfect place" , "Sir Thomas More's perfect country" , "Ideal realm" , "of limited interest to G&S" .)