Crossword Genius

Take part not all of whole (missing fifth) (7)

Ross

I believe the answer is:

compete

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'take part' is the definition.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for compete that I've seen before include "Vie, contest" , "Take part (in race)" , "Strive (against others)" , "Engage in a contest" , "Struggle for victory" .)

I've seen this clue in The Guardian.
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