Crossword puzzle clue "joined together as groups with up"

closely attached; growing together, esp. in an unusual fashion

ATTACH, to connect as an associated part

the act or an instance of conjoining

(Greek) a group of nine

FUSE, to equip with a detonating device, also FUZE

(archaic) 3rd person singular of have, to possess

to make a garment by joining loops of yarn