Crossword Genius

Very slight force fluctuating in the raw outside (5-4)

Ross

I believe the answer is:

wafer-thin

But I can't explain it at all!

(Other definitions for wafer-thin that I've seen before include "Having very little width or substance" , "Very fine" , "Very narrow" , "Having little thickness" , "Warn thief stealing slim biscuit - very slim" .)

I've seen this clue in The Times.
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