Inept old minister initially shaken, church members not being up for service (9)

I believe the answer is:

impotence

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'members not being up for service' is the definition.
I can't judge whether this defines the answer.

'inept old minister initially shaken church' is the wordplay.
'initially' indicates taking the first letters.
'shaken' indicates anagramming the letters.
'church' becomes 'ce' (abbreviation for Church of England).
The first letters of 'old minister' is 'om'.
'inept'+'om'='ineptom'
'ineptom' is an anagram of 'impoten'.
'impoten'+'ce'='IMPOTENCE'

Can you help me to learn more?

(Other definitions for impotence that I've seen before include "Weakness" , "ineffectualness" , "Helplessness, powerlessness" .)

I've seen this clue in The Independent.

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