Crossword Genius

I'd flipped over, repose being most terrible (6)

Ross

I believe the answer is:

direst

'most terrible' is the definition.
('dire' can be a synonym of 'terrible')

'i'd flipped over repose' is the wordplay.
'flipped over' shows that the letters should be reversed in order.
'repose' becomes 'rest' ('rest' can be a synonym of 'repose').
'id' back-to-front is 'di'.
'di'+'rest'='DIREST'

'being' is the link.

(Other definitions for direst that I've seen before include "far from ideal" , "Most horrific" .)

I've seen this clue in The Times.
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