Yet it's turned left twice (5)
I believe the answer is:
still
'yet' is the definition.
('still' can be a synonym of 'yet')
'it's turned left twice' is the wordplay.
'turned' shows that the letters should be reversed in order.
'left' becomes 'l' (common abbreviation).
'twice' shows that letters should be duplicated.
'its' reversed gives 'sti'.
'l' duplicated is 'll'.
'sti'+'ll'='STILL'
(Other definitions for still that I've seen before include "in spite of this" , "activity of one manufacturing spirits?" , "Stationary" , "Unmoving yet" , "subdued" .)