Parts you may have thrilled to? (4)

I believe the answer is:

bits

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'parts' is the definition.
(bit is a kind of part)

I cannot understand how the rest of the clue works.

(Other definitions for bits that I've seen before include "Small units of digital memory" , "Small pieces" , "Pieces, fragments" , "Parts" .)

I've seen this clue in the Evening Standard.

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