I see grandparent stopping stupidly (7)

I believe the answer is:

inanely

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'stupidly' is the definition.
(I've seen this before)

'i see grandparent stopping' is the wordplay.
'see' becomes 'ely' (see is a place with a cathedral - e.g. Ely).
'grandparent' becomes 'nan' (I can't justify this - if you can you should give a lot more credence to this answer).
'stopping' is an insertion indicator (inserted letters stop or plug a gap).
'i'+'ely'='iely'
'iely' enclosing 'nan' is 'INANELY'.

Can you help me to learn more?

(Other definitions for inanely that I've seen before include "in a daft way" , "Senselessly" , "In a fatuous manner" , "Stupidly" , "Vapidly" .)

I've seen this clue in The Independent.

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