Heads over ahead of schedule; good to make heavenly entrance (6,5)

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

PATES (heads), containing (over) EARLY (ahead of schedule) + G (abbreviation for good). Name for the entrance to Heaven; from the description in the book of Revelation, where the heavenly city has twelve gates, each consisting of a single pearl.