A part of Sandra Bullock elevated by Shakespeare (4)
I believe the answer is:
bard
'shakespeare' is the definition.
(I've seen this before)
'a part of sandra bullock elevated' is the wordplay.
'a part of' indicates a hidden word.
'elevated' says the letters should be written backwards.
'drab' is hidden in the letters of 'sandra bullock'.
'drab' reversed gives 'BARD'.
'by' is the link.
(Other definitions for bard that I've seen before include "Gray, perhaps" , "Traditional poet" , "Animal; cruel person" , "A drab sort of old poet" , "Ancient poet" .)