Poor as review about new singer (7)
I believe the answer is:
soprano
'singer' is the definition.
(type of singing voice)
'poor as review about new' is the wordplay.
'review' indicates an anagram.
'about' means one lot of letters goes inside another.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'poor'+'as'='pooras'
'pooras' is an anagram of 'soprao'.
'soprao' going around 'n' is 'SOPRANO'.
(Other definitions for soprano that I've seen before include "chorus girl, perhaps" , "Highly vocal musician" , "Sutherland?" , "Norman, perhaps" , "High female voice" .)