Crossword Genius

Begin quietly then grow readiness for undertaking (10)

Ross

I believe the answer is:

enterprise

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

'undertaking' is the definition.
(enterprise is a kind of undertaking)

'begin quietly then grow readiness' is the wordplay.
I cannot quite see how this works, but
'quietly' could be 'p' (p for piano and quiet) and 'p' is found in the answer.
'grow' could be 'rise' (rising is a kind of growing) and 'rise' is found in the answer.
The remaining letters 'enter' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'for' is the link.

Can you help me to learn more?

(Other definitions for enterprise that I've seen before include "Plan" , "Company" , "Initiative - undertaking - business" , "audacity" , "Data may be on-board here" .)

I've seen this clue in The Telegraph.
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