Planner not so sensible, squashing resistance (7)
I believe the answer is:
drafter
'planner' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for drafter that I've seen before include "person to draw up a document" , "She plans" .)