Aquarium growth (5)
'aquarium growth' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for algae that I've seen before include "Type of seaweed" , "Simple organisms, e.g. seaweeds" , "Simple plants, such as plankton" , "Primitive organisms" , "'Simple plants, such as seaweed (5)'" .)
'aquarium growth' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for alga that I've seen before include "Plants such as seaweed" , "Simple, non-flowering, aquatic plant" , "Simple plant, plankton or seaweed say" , "Water plant with no stem or leaves" , "nuisance on the beach?" .)