Assemble kit in a good mood (3,2)

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

RIG (kit = equipment, as in the “lighting rig” in a theatre) + UP (in a good mood). Not my favourite clue because “rig” in both definition and wordplay has the same root meaning, although one is a verb and the other a noun; also this meaning of “up” is more or less repeated in the next clue.