It presents terrible beauty (10)
I believe the answer is:
prettiness
'beauty' is the definition.
(prettiness is a kind of beauty)
'it presents terrible' is the wordplay.
'terrible' indicates anagramming the letters.
'it'+'presents'='itpresents'
'itpresents' with letters rearranged gives 'PRETTINESS'.
(Other definitions for prettiness that I've seen before include "Attractive quality" , "1 across (anag)" , "13 [ATTRACTIVE] state" .)