Crossword Genius

Challenge for somebody thrown in the deep end, in two senses (4,2,4)

Ross

I believe the answer is:

sink or swim

(Other definitions for sink or swim that I've seen before include "Do/die strategy" , "Survive (or not) by one's own efforts" , "Cope (or not) unaided" , "To succeed or fail (the only options!)" .)

I've seen this clue in the Universal.
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