Trap crime family first - it's becoming known (7,2)
I believe the answer is:
sinking in
'becoming known' is the definition.
'trap crime family first' is the wordplay.
'trap' becomes 'gin' (gin trap is a kind of animal trap).
'crime' becomes 'sin'.
'family' becomes 'kin' (synonyms).
'first' says to put letters next to each other.
'sin'+'kin'='sinkin'
'gin' put after 'sinkin' is 'SINKING IN'.
'it's' acts as a link.
(Another definition for sinking in that I've seen is " becoming clear".)
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