Ran em out 'n' got in 'n' settled in nicely (8)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

S [m] UGGLED (ran, as in “rum runner” = smuggler of alcoholic drinks), with the M (em = a name for the letter M) taken out and ‘N (from clue text) put in its place (got in).