Gunner keeping agile moved royal insignia (7)

I believe the answer is:

regalia

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

'royal insignia' is the definition.
(I've seen this in another clue)

'gunner keeping agile moved' is the wordplay.
'gunner' becomes 'ra' (I can't explain this - if you can you should believe this answer much more).
'keeping' means one lot of letters goes inside another.
'moved' indicates an anagram.
'agile' anagrammed gives 'egali'.
'ra' going around 'egali' is 'REGALIA'.

Can you help me to learn more?

(Other definitions for regalia that I've seen before include "Royal items" , "Royal insignia" , "Orb and sceptre, for example" , "Paraphernalia indicative of high office" , "Algeria (anag)" .)

I've seen this clue in The Sun.

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