Greatly upset about husband’s aversion to any action? (8)

I believe the answer is:

lethargy

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'aversion to any action?' is the definition.
I can't tell whether this definition defines the answer.

'greatly upset about husband's' is the wordplay.
'upset' is an anagram indicator.
'about' is an insertion indicator.
'husband' becomes 'h' (abbreviation).
'greatly' is an anagram of 'letargy'.
'letargy' enclosing 'h' is 'LETHARGY'.

Can you help me to learn more?

(Other definitions for lethargy that I've seen before include "Inertia" , "Extreme lack of energy, listlessness" , "Weariness" , "Stringed instrument" , "Lassitude, languor" .)

I've seen this clue in The Times.

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