1 across
Customized
bicycle’s
hollow
wheel
feature
(7)
Customized bicycle’s hollow wheel feature (7)
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The definition is at the beginning of the clue.
How the clue works
Right, so Customized is your definition, that's the whole clue pointing to "made to order". For the wordplay, "hollow" tells you to gut the word "bicycle", leaving just its outer letters, BE. Stick that in front of SPOKE, which is literally a wheel feature, and BE plus SPOKE gives you the answer.