Benjamin holds the right gun (4)

I believe the answer is:

bren

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'gun' is the definition.
(Bren is an example)

'benjamin holds the right' is the wordplay.
'benjamin' becomes 'ben' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'holds' indicates putting letters inside.
'the right' becomes 'r' (common abbreviation).
'ben' enclosing 'r' is 'BREN'.

Can you help me to learn more?

(Other definitions for bren that I've seen before include "Weapon" , "Light machine gun (made in Brno and Enfield)" , "World War Two machine gun" , "Machine-gun" .)

I've seen this clue in the Evening Standard.

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