Plant life spotted in Trafalgar (4)

I believe the answer is:

alga

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'plant life' is the definition.
'alga' can be an answer for 'plant' (I have seen 'Primitive plant' mean 'alga' so perhaps 'plant' could also mean 'alga'). I'm unsure of the 'life' bit.

'in trafalgar' is the wordplay.
'in' indicates a hidden word.
'ALGA' is hidden in the letters of 'trafalgar'.

'spotted' acts as a link.

Can you help me to learn more?

(Other definitions for alga that I've seen before include "Gala class of seaweed" , "Water plant with no stem or leaves" , "from ore found locally" , "Simple, non-flowering, aquatic plant" , "Aquatic organism such as plankton" .)

I've seen this clue in The Irish Times.

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