Dramatic art giant? (8)
I believe the answer is:
rattigan
'dramatic art giant?' is the definition.
The definition suggests a singular noun which matches the answer.
'dramatic art giant?' is the wordplay.
'dramatic' is an anagram indicator.
'art'+'giant'='artgiant'
'artgiant' is an anagram of 'RATTIGAN'.
(Other definitions for rattigan that I've seen before include "Terence --, English playwright" , "Playfellow" , "Writer" , "20th-century playwright" .)