With no heart for farm work, a building job's the answer (6)

I believe the answer is:

tiling

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'answer' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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