Crossword Genius

Countless milkmaids initially backing their workplace (6)

Ross

I believe the answer is:

myriad

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

'countless' is the definition.
(I know that countless can be written as myriad)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for myriad that I've seen before include "Host" , "A great number" , "Large indefinite number" , "Too numerous to be counted" , "Many" .)

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