Crossword Genius

A few alerts about tiny crustaceans (5,5)

Ross

I believe the answer is:

water fleas

I'm a little stuck... Click here to teach me more about this clue!

'tiny crustaceans' is the definition.
'water fleas' can be an answer for 'crustaceans' (water flea is a kind of crustacean). I'm not certain of the 'tiny' bit.

'a few alerts about' is the wordplay.
'about' indicates an anagram.
'a'+'few'+'alerts'='afewalerts'
'afewalerts' is an anagram of 'WATER FLEAS'.

Can you help me to learn more?

I've seen this clue in The Sunday Times and The Times.
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