Salad dressing, month old (4)

I believe the answer is:

mayo

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'salad dressing' is the definition.
'mayo' can be an answer for 'dressing' (mayo is a condiment or dressing). I'm unsure of the 'salad' bit.

'month old' is the wordplay.
'month' becomes 'may' (May is an example).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'may'+'o'='MAYO'

Can you help me to learn more?

(Other definitions for mayo that I've seen before include "Ir. county; salad dressing" , "Eg, Braeburn or Cox" , "Irish county - sauce (abbr)" , "Irish county -- salad cream" , "Irish county (county town, Castlebar)" .)

I've seen this clue in The Times.

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