Literary composition on page — very small piece? (8)

I believe the answer is:

particle

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'very small piece?' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for particle that I've seen before include "Tiny piece of anything" , "tiny portion" , "Minute fragment" , "Tiny piece of matter" , "Minute portion" .)

I've seen this clue in The Times.

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