Old Indian copper seizing figure's sensitive appendage (7)
I believe the answer is:
antenna
'sensitive appendage' is the definition.
(appendage belonging to some animals)
'old indian copper seizing figure's' is the wordplay.
'old indian copper' becomes 'anna' (historical coin of India).
'seizing' indicates putting letters inside.
'figure' becomes 'ten' (I've seen this in other clues).
'anna' enclosing 'ten' is 'ANTENNA'.
(Other definitions for antenna that I've seen before include "connected to 41?" , "Feeling part" , "Aerial - insect feeler" , "receiver" , "sensitive feeler" .)