Crossword Genius

Planner not so sensible, squashing resistance (7)

Ross

I believe the answer is:

drafter

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'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" .)

I've seen this clue in The Guardian.
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