Crossword Genius

Small skirt's pinned on back (5)

Ross

I believe the answer is:

minor

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'small' is the definition.
(I know that small can be written as minor)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for minor that I've seen before include "Adolescent" , "Small-scale - child" , "Slight; little known" , "Of lesser importance" , "Smaller - child" .)

I've seen this clue in The Guardian.
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