Crossword Genius

Schemer has an allotment? (7)

Ross

I believe the answer is:

plotter

I'm a little stuck... Click here to teach me more about this clue!

'schemer' is the definition.
(I know that schemer can be written as plotter)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for plotter that I've seen before include "Schemer" , "Conspirator's" , "One who schemes" , "Conspirator" .)

I've seen this clue in The Daily Express.
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