Crossword Genius

To pile Pelion on ____ is to aggravate a situation (4)

Ross

I believe the answer is:

ossa

(Other definitions for ossa that I've seen before include "To pile Pelion upon - is to make even greater" , "So as to become a Greek mountain" , "So as to turn to bones" , "mountain in Thessaly" , "Technical name for bones" .)

I've seen this clue in The Sunday Times and The Times.
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