Read about my being vague (6)
I believe the answer is:
dreamy
'vague' is the definition.
(I've seen this before)
'read about my' is the wordplay.
'about' is an anagram indicator.
'read' with letters rearranged gives 'drea'.
'drea'+'my'='DREAMY'
'being' acts as a link.
(Other definitions for dreamy that I've seen before include "With a pleasantly unreal quality" , "delightful" , "Vague - pensive" , "Languorous" , "quite impractical" .)