Fir cones come from them (8)

I believe the answer is:

conifers

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'them' is the definition.
I can't tell whether this defines the answer.

'fir cones come' is the wordplay.
'fir cones' anagrams to 'CONIFERS'.
However, I'm unsure how this is indicated.

'from' acts as a link.

Can you help me to learn more?

(Other definitions for conifers that I've seen before include "Pines, firs, cypresses" , "Evergreen trees" .)

I've seen this clue in The Globe and Mail.

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