It produces fuel, free stuff and regalia (8)

I believe the answer is:

refinery

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'it produces fuel' is the definition.
The definition suggests a singular noun which matches the answer.

'free stuff and regalia' is the wordplay.
'stuff' says to take the centre (I've seen 'stuffing' mean this).
'and' is a charade indicator (letters next to each other).
'regalia' becomes 'finery' (synonyms).
The central letters of 'free' are 're'.
're'+'finery'='REFINERY'

Can you help me to learn more?

(Other definitions for refinery that I've seen before include "Where oil is processed" , "Purification plant" , "Industrial plant for purifying a crude substance" , "Plant for purifying, oil say" , "Place for improving crude material" .)

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

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