Heading for Piccadilly Nimrod leaves Henry with client (6)

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

First letter (heading) of P [iccadilly], then [h] UNTER (Nimrod in the Old Testament is described as a “mighty hunter”) without the H (abbreviation for Henry = unit of electrical inductance). Punter = slang for a client or customer.