Leading characters in television and radio understand objective (6)
I believe the answer is:
target
'objective' is the definition.
(I know that objective can be written as target)
'leading characters in television and radio understand' is the wordplay.
I cannot really understand how this works, but
'understand' could be 'get' (getting is a kind of understanding) and 'get' is present in the answer.
The remaining letters 'tar' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for target that I've seen before include "Butt" , "aunt Sally" , "Select for attack" , "One aimed at" , "Goal; victim" .)