Pond growth (5)
'pond 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 "Water plants seen in a gale" , "Aquatic growths" , "Seaweeds etc" , "'Simple plants, such as seaweed (5)'" , "Primitive organisms" .)
'pond growth' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for alga that I've seen before include "from ore found locally" , "Eg, seaweed" , "Primitive non-flowering, mainly aquatic, plant" , "Gala (anag.)" , "Simple, non-flowering, aquatic plant" .)