Crossword Genius

Foolish patient forgetting a time for treatment (5)

Ross

I believe the answer is:

inept

'foolish' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for inept that I've seen before include "Hopeless; bungling" , "Clumsy and incompetent" , "Clumsy, bumbling" , "Showing a lack of competence" , "Awkward, showing no skill" .)

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