Crossword Genius

Where salt may be taken, if necessary? (2,1,5)

Ross

I believe the answer is:

at a pinch

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'if necessary?' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

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(Other definitions for at a pinch that I've seen before include "In case of necessity" , "In time of difficulty or necessity - nip it" , "If absolutely necessary" , "if need be" , "under pressure" .)

I've seen this clue in The Telegraph.
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