Not in favour of being in charge after dreadful stagnation (12)

I believe the answer is:

antagonistic

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'not in favour of being' is the definition.
I can't tell whether this defines the answer.

'in charge after dreadful stagnation' is the wordplay.
'in charge' becomes 'ic' (abbreviation for 'in charge').
'after' says to put letters next to each other.
'dreadful' indicates an anagram.
'stagnation' is an anagram of 'antagonist'.
'ic' after 'antagonist' is 'ANTAGONISTIC'.

Can you help me to learn more?

(Other definitions for antagonistic that I've seen before include "Ill-disposed" , "Actively opposing - stag in action (anag)" , "Actively hostile" .)

I've seen this clue in The Irish Independent.

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