Entirely sound company taking on women. Gee whiz! (4,3)

I believe the answer is:

holy cow

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'gee whiz' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'entirely sound company taking on women' is the wordplay.
'entirely sound' becomes 'holy' (I am not sure about this - if you are sure you should believe this answer much more).
'company' becomes 'co' (abbreviation).
'taking on' is a charade indicator (letters next to each other).
'women' becomes 'w' (standard abbreviation).
'holy'+'co'+'w'='HOLY COW'

Can you help me to learn more?

(Other definitions for holy cow that I've seen before include "The goodness" , "Blimey!" .)

I've seen this clue in the Sydney Morning Herald.

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