Worker has one skill, a creative activity (10)

I believe the answer is:

handicraft

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'a creative activity' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'worker has one skill' is the wordplay.
'worker' becomes 'hand' (hand is a kind of worker).
'has' means one lot of letters go next to another.
'one' becomes 'I' (Roman numeral).
'skill' becomes 'craft' (craft is a kind of skill).
'hand'+'i'+'craft'='HANDICRAFT'

Can you help me to learn more?

(Other definitions for handicraft that I've seen before include "sewer's output perhaps" , "manual skill" .)

I've seen this clue in the Sydney Morning Herald.

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