Gradually moves a very short distance (6)

I believe the answer is:

inches

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'short distance' is the definition.
(an inch is a small measurement)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for inches that I've seen before include "Moves away; units of measurement" , "Short lengths" , "Small islands" , "Moves slowly and cautiously" , "Moves in small steps" .)

I've seen this clue in The Times.

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