I must replace last of cycling apparel (6)

I believe the answer is:

bikini

I'm a little stuck... Click here to teach me more about this clue!

'apparel' is the definition.
(bikini is a kind of apparel)

I cannot understand how the rest of the clue works.

(Other definitions for bikini that I've seen before include "Small two-piece bathing suit" , "Site of A-Bomb tests; resultantly shocking swimwear!" , "Coral island" , "Skimpy two-piece swim wear" , "practised here with explosive results" .)

I've seen this clue in The Independent.

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