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Fiery, being of S American lineage (12)

Ross

I believe the answer is:

incandescent

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'fiery' is the definition.
(thesaurus)

'american lineage' is the wordplay.
'american' becomes 'incan' (I have seen 'Old American' mean 'incan' so perhaps 'american' could also mean 'incan').
'lineage' becomes 'descent' (synonyms).
'incan'+'descent'='INCANDESCENT'

'being of s' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.

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(Other definitions for incandescent that I've seen before include "Glowing with heat" , "Furious" , "livid" , "Mad" , "Brilliant" .)

I've seen this clue in The Everyman puzzle in The Observer.
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