Why is a report unusually deserving of approval? (12)
I believe the answer is:
praiseworthy
'deserving of approval?' is the definition.
(I've seen this before)
'why is a report unusually' is the wordplay.
'unusually' indicates an anagram.
'why'+'is'+'a'+'report'='whyisareport'
'whyisareport' is an anagram of 'PRAISEWORTHY'.
(Other definitions for praiseworthy that I've seen before include "Deserving of approval" , "Laudable" , "Commendable" , "Admirable" .)