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' suggests taking the first letters.
'shaken' indicates anagramming the letters.
'church' becomes 'ce' (Church of England).
The initial letters of 'old minister' is 'om'.
'inept'+'om'='ineptom'
'ineptom' anagrammed gives '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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