More work repairing high-class patio (6)
I believe the answer is:
utopia
'more work' is the definition.
(work by Sir Thomas More)
'repairing high-class patio' is the wordplay.
'repairing' is an anagram indicator (the order is repaired).
'high class' becomes 'U' (as in U and non-U speech).
'u'+'patio'='upatio'
'upatio' anagrammed gives 'UTOPIA'.
(Other definitions for utopia that I've seen before include "impossible to find" , "Sir Thomas More's perfect country" , "More's ideal world" , "Eden" , "Sir Thomas More's perfect place" .)