Feeling that karate teacher is legless (5)

I believe the answer is:

sense

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'feeling' is the definition.
(I've seen this in other clues)

I can't explain the rest of the clue.

(Other definitions for sense that I've seen before include "Get an impression" , "definition" , "See 16" , "Gumption -- feeling" , "Feeling - reason" .)

I've seen this clue in The Mirror.

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