Crossword Genius

Frank, with a gun, is so welcoming (4-5)

Ross

I believe the answer is:

open-armed

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'so welcoming' is the definition.
'open-armed' can be an answer for 'welcoming' (I've seen this before). I am not certain of the 'so' bit.

'frank with a gun' is the wordplay.
'frank' becomes 'open' (synonyms).
'with' says to put letters next to each other.
'a gun' becomes 'armed' (I can't justify this - if you can you should give a lot more credence to this answer).
'open'+'armed'='OPEN-ARMED'

'is' acts as a link.

Can you help me to learn more?

(Another definition for open-armed that I've seen is " Welcoming".)

I've seen this clue in the Sydney Morning Herald.
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