Gang mad that odd characters are not in range (3)
I believe the answer is:
aga
'range' is the definition.
(I've seen this in other clues)
'gang mad that odd characters are not in' is the wordplay.
'that odd characters are not in' indicates alternate letters (odd-numbered letters get removed).
'gang'+'mad'='gangmad'
The alternating letters of 'gangmad' are 'AGA'.
(Other definitions for aga that I've seen before include "military leader" , "Palindromic Muslim title, as for Khan" , "Military official" , "Eastern potentate" , "Military commander in the Ottoman Empire" .)