Low-down type initiated contacts with former mistress? Nob (9)

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

GEN (low-down = slang for information) + first letter (. . . initiated) of T [ype] + LEMAN (a lover, but with “former” to indicate that it’s an archaic word). Nob = slang for upper-class person (gentleman) as perceived by someone of a lower class.