Crossword Genius

Blue sea-monkeys are open to exploitation (7)

Ross

I believe the answer is:

useable

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

'open to exploitation' is the definition.
I can't judge whether this defines the answer.

'blue sea-monkeys' is the wordplay.
'blue sea' anagrams to 'USEABLE'.
But, I'm not sure how the anagram is indicated.

'are' acts as a link.

Can you help me to learn more?

(Another definition for useable that I've seen is " deployed".)

I've seen this clue in the Sydney Morning Herald.
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