Crossword Genius

Ancient worker an experienced one (3,4)

Ross

I believe the answer is:

old hand

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'an experienced one' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'ancient worker' is the wordplay.
'ancient' becomes 'old' (similar in meaning).
'worker' becomes 'hand' (hand is a kind of worker).
'old'+'hand'='OLD HAND'

Can you help me to learn more?

(Other definitions for old hand that I've seen before include "Experienced or well-practised person" , "Person with a lot of experience" , "expert?" , "Experienced or practised person - manually aged?" , "Gothic script" .)

I've seen this clue in The Sun.
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