Crossword Genius

E.g. insert mobile numbers (8)

Ross

I believe the answer is:

integers

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

'numbers' is the definition.
(integer is a kind of number)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for integers that I've seen before include "Steering in whole numbers" , "Whole numbers, not fractions" , "Steering (anag)" .)

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