Hired assassins gather them in (6)

I believe the answer is:

hitmen

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'hired assassins' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'gather them in' is the wordplay.
'gather' indicates anagramming the letters (I've seen 'gathered' mean this).
'them'+'in'='themin'
'themin' is an anagram of 'HITMEN'.

Can you help me to learn more?

(Another definition for hitmen that I've seen is " Offers".)

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