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Tip up (4)

Ross

I believe the answer is:

tilt

(Other definitions for tilt that I've seen before include "Engage in a medieval joust - lean" , "Inclination, joust" , "Move into a sloping position, say a lance" , "Slight inclination" , "Lean, slope" .)

I've seen this clue in The Mirror, The Telegraph and the Evening Standard.
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