Not having a ghost of eagerness and energy? (10)

I believe the answer is:

spiritless

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'not having a ghost' is the definition.
I can't tell whether this defines the answer.

'eagerness and energy?' is the wordplay.
'eagerness' becomes 'less' (I am not sure about this - if you are sure you should believe this answer much more).
'and' is a charade indicator (letters next to each other).
'energy?' becomes 'spirit' (energy is a kind of spirit).
'less' put after 'spirit' is 'SPIRITLESS'.

'of' is the link.

Can you help me to learn more?

(Another definition for spiritless that I've seen is " Lacking ardour".)

I've seen this clue in the Evening Standard.

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