One involved in dramas with gun? (9)

I believe the answer is:

guardsman

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'one' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'involved in dramas with gun?' is the wordplay.
'involved in' is an anagram indicator (involved can mean complex or confusing).
'with' means one lot of letters go next to another.
'dramas'+'gun'='dramasgun'
'dramasgun' is an anagram of 'GUARDSMAN'.

Can you help me to learn more?

(Another definition for guardsman that I've seen is " Soldier".)

I've seen this clue in The Sun.

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