Eagle, one escaping from captivity, to depart (6)

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

A charade of G[a]OL (‘captivity’) minus the A (‘one escaping’) plus DIE (‘depart’). GOLDIE was a golden eagle which escaped (twice) from London Zoo. Not golden, but a pair of bald eagles have taken up residence around a lake a mile or so from where I live.