Take off electronic band (6)
I believe the answer is:
stripe
'band' is the definition.
(I know that band can be written as stripe)
'take off electronic' is the wordplay.
'take off' becomes 'strip ' (stripping is a kind of taking off).
'electronic' becomes 'e' (as in e-mail or e-books).
'strip'+'e'='STRIPE'
(Other definitions for stripe that I've seen before include "Military sign of rank" , "bar" , "Military mark of rank, chevron" , "Distinctive band" , "Military rank indicator" .)