Being on the shelf maddens Sadie! (5)
I believe the answer is:
aside
'being' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'the shelf maddens sadie' is the wordplay.
'sadie' can be anagrammed to 'ASIDE'.
However, I am not sure how the anagram is indicated.
'on' is the link.
Can you help me to learn more?
(Other definitions for aside that I've seen before include "Privately, apart" , "Words spoken apart in an undertone" , "Actor's line directed solely to audience" , "Whispered comment" , "private" .)