Pin that's blue holding nothing up (5)

I believe the answer is:

dowel

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'pin' is the definition.
(peg for fixing together components of a structure)

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

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(Other definitions for dowel that I've seen before include "Headless peg used for joining components" , "Peg used in joinery" , "Fastening peg for joint" , "Pin that holds two pieces of wood together" , "Wooden pin used in carpentry" .)

I've seen this clue in The Telegraph.

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