Concerned with one sensory organ stealing power of another (5)
I believe the answer is:
optic
'concerned with one sensory organ' is the definition.
'optic' can be an answer for 'organ' (optic is a kind of organ). I am unsure of the 'concerned with one sensory' bit.
'stealing power of another' is the wordplay.
'stealing' is an insertion indicator.
'power' becomes 'p' (symbol in physics).
'of another' becomes 'otic' (I am not sure about this - if you are sure you should believe this answer much more).
'p' put into 'otic' is 'OPTIC'.
(Other definitions for optic that I've seen before include "connected to the eye" , "Eye - spirit measure" , "Topic (anag.)" , "Relating to sight" , "affecting vision?" .)