Odd characters in Corby yell (3)
I believe the answer is:
cry
'yell' is the definition.
(I know that yell can be written as cry)
'odd characters in corby' is the wordplay.
'odd characters in' means one should take alternating letters (the letters at odd-numbered positions).
The alternate letters of 'corby' are 'CRY'.
(Other definitions for cry that I've seen before include "Shed tears" , "Blubber" , "produce tears" , "Call" , "Sob or shout" .)