An inclination to be less than upright (5)

I believe the answer is:

slant

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'an inclination' is the definition.
(slant is a kind of inclination)

I can't explain the remainder of the clue.

(Other definitions for slant that I've seen before include "Point of view; slope" , "Chance" , "It's at an angle to the horizontal" , "Deviation from the horizontal" , "Angle; incline" .)

I've seen this clue in the Evening Standard.

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