Almost entirely set free (4)

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

almost, but not QUITe adding later:  according to my Chambers, a long way down the definitions (among the obsolete usages),  “to quit” is “to free” (verb) and as an adjective “quit” means “set free”.   “Quite” is defined as: completely, wholly, entirely, …  The wordplay is that “almost QUITE” = QUITe with the final letter removed.  Obviously, the brevity that amused me at 2am is misplaced