See sides being removed from organ (4)
I believe the answer is:
otic
'organ' is the definition.
(I've seen this before)
'see sides being removed from' is the wordplay.
'see' becomes 'notice' (I've seen this before).
'sides being removed from' indicates the central letters.
The middle of 'notice' is 'OTIC'.
(Other definitions for otic that I've seen before include "Relating to the ear" , "of concern to the listener" , "of lugs" , "relating to area incorporating canal" , "Relating to ears" .)