Crossword Genius

Number one component

Ross

I believe the answer is:

unit

This clue is a triple definition!

'number' is the first definition.
(unit is a kind of number)

'one' is the second definition.
(synonyms)

'component' is the third definition.
(I've seen this in another clue)

(Other definitions for unit that I've seen before include "Single undivided entity" , "Mexican maize pancake" , "Single thing or person" , "Some fighting men" , "Part of a kit" .)

I've seen this clue in The Daily Mail.
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