Padre’s lain out a man (4)

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

CHAP [lain] (padre) with the LAIN taken out. I’m not sure the grammar quite works, because I think the past tense of “lay out” is “has laid out”, and “has lain” is the past tense of “lie” (as in lie down); but there are probably counter-examples.