Crossword Genius

Showy elderly relative does initially impressive cartwheels (9)

Ross

I believe the answer is:

grandiose

I'm a little stuck... Click here to teach me more about this clue!

'showy' is the definition.
(thesaurus)

'elderly relative does initially impressive cartwheels' is the wordplay.
I cannot quite understand how this works, but
'relative' could be 'gran' (short for grandmother) and 'gran' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for grandiose that I've seen before include "Pretentiously magnificent" , "I grade son as affectedly splendid" , "affected" , "Ambitious" , "Bombastic" .)

I've seen this clue in The Independent.
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