Crossword Genius

Retailer's opening guide for one making a career (6)

Ross

I believe the answer is:

rusher

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'for one making a career' is the definition.
I can't tell whether this defines the answer.

'retailer's opening guide' is the wordplay.
'opening' says to take the initial letters.
'guide' becomes 'usher' (an usher guides people).
The initial letter of 'retailers' is 'r'.
'r'+'usher'='RUSHER'

Can you help me to learn more?

(Another definition for rusher that I've seen is " One charging".)

I've seen this clue in The Times.
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