Conglomerate ink producer? (7)
I believe the answer is:
octopus
I believe this clue is a double definition.
'conglomerate' is the first definition.
(I've seen this in another clue)
'ink producer?' is the second definition.
(octopuses secrete ink)
(Other definitions for octopus that I've seen before include "pernicious organisation" , "Tentacled cephalopod" , "something from La Mer?" , "Sea creature - pulpo on a Spanish menu" , "One well-armed" .)