Each one left in danger (5)
I believe the answer is:
peril
'in danger' is the definition.
(I've seen this before)
'each one left' is the wordplay.
'each' becomes 'per'.
'one' becomes 'li' (I've seen this in other clues).
'left' is a reversal indicator.
'li' backwards is 'il'.
'per'+'il'='PERIL'
(Other definitions for peril that I've seen before include "risk" , "Danger, jeopardy" , "Danger of serious kind" , "Danger, hazard" , "Great danger" .)