Primarily, milady's helper? (4)

I believe the answer is:

maid

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'primarily milady's helper?' is the definition.
I can't tell whether this definition defines the answer.

'primarily milady's helper?' is the wordplay.
'primarily' suggests taking the first letters.
'helper?' becomes 'aid' (something which helps).
The initial letter of 'miladys' is 'm'.
'm'+'aid'='MAID'

Can you help me to learn more?

(Other definitions for maid that I've seen before include "daughter?" , "- - -of-all-work" , "Damsel" , "Serving girl" , "Female domestic servant" .)

I've seen this clue in The Times.

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