Source of fir-cones? (8)

I believe the answer is:

conifers

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'source of fir-cones?' is the definition.
I can't tell whether this defines the answer.

'of fir-cones?' is the wordplay.
'of' indicates an anagram (the answer comes from or 'of' the letters).
'fir'+'cones'='fircones'
'fircones' with letters rearranged gives 'CONIFERS'.

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

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

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