Sour narco turns out to be bitterly hostile (9)

I believe the answer is:

rancorous

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'bitterly hostile' is the definition.
'rancorous' can be an answer for 'hostile' (thesaurus). I am not certain of the 'bitterly' bit.

'sour narco turns out' is the wordplay.
'turns out' indicates anagramming the letters.
'sour'+'narco'='sournarco'
'sournarco' anagrammed gives 'RANCOROUS'.

'to be' is the link.

Can you help me to learn more?

(Other definitions for rancorous that I've seen before include "spiteful?" , "Showing bitter resentment" , "Resentful, bitter" , "Acrimonious" .)

I've seen this clue in The Irish Times.

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