Crossword Genius

Have no hope of converting to fresh water (4,3,5)

Ross

I believe the answer is:

fear the worst

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

'have no hope' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'converting to fresh water' is the wordplay.
'converting' is an anagram indicator.
'to'+'fresh'+'water'='tofreshwater'
'tofreshwater' anagrammed gives 'FEAR THE WORST'.

'of' acts as a link.

Can you help me to learn more?

(Another definition for fear the worst that I've seen is " Be most pessimistic".)

I've seen this clue in The Hindu.
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