Flag-waving father joins group, getting twitch (9)

I believe the answer is:

patriotic

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'flag-waving' is the definition.
(similar in meaning)

'father joins group getting twitch' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'joins' is a charade indicator (letters next to each other).
'group getting' becomes 'trio' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'twitch' becomes 'tic' (tic is a kind of twitch).
'pa'+'trio'+'tic'='PATRIOTIC'

Can you help me to learn more?

(Other definitions for patriotic that I've seen before include "Supporting the state" , "Having love for one's country" , "flag-waving?" , "Loyal" , "Devoted to one's country" .)

I've seen this clue in The Daily Express.

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