Crossword Genius

The old-fashioned DA, say? (7)

Ross

I believe the answer is:

haircut

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'the old-fashioned da say?' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

This is the entire clue.

Can you help me to learn more?

(Other definitions for haircut that I've seen before include "Crop possibly" , "Style of coiffure" , "Bob possibly" , "Mohican, possibly" , "shock treatment" .)

I've seen this clue in the Evening Standard.
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