Understanding directions for pen strokes to draw F on its side? (5)

I believe the answer is:

sense

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'understanding' is the definition.
(sense is a kind of understanding)

I don't understand how the remainder of the clue works.

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(Other definitions for sense that I've seen before include "Feeling - reason" , "Could be hearing" , "eg Taste, smell" , "Perceptual faculty" , "Meaning of a word or expression" .)

I've seen this clue in The Times.

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