Zodiacal sign not divulged by officer workers? (11)

I believe the answer is:

secretaries

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'workers?' is the definition.
(secretary is a kind of worker)

'zodiacal sign' is the wordplay.
'zodiacal' becomes 'secret' (I can't explain this - if you can you should give a lot more credence to this answer).
'sign' becomes 'aries' (star sign).
'secret'+'aries'='SECRETARIES'

'not divulged by officer' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

I've seen this clue in The Irish Independent.

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