Trade is in its impractical folk (9)

I believe the answer is:

idealists

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'trade is in its impractical folk' is the definition.
I can't tell whether this defines the answer.

'trade is in its' is the wordplay.
'trade' becomes 'deal' (synonyms).
'in' means one lot of letters goes inside another.
'deal'+'is'='dealis'
'dealis' put inside 'its' is 'IDEALISTS'.

Can you help me to learn more?

(Another definition for idealists that I've seen is " visionaries".)

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

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