Danger for each one left (5)
I believe the answer is:
peril
'danger' is the definition.
(synonyms)
'each one left' is the wordplay.
'each' becomes 'per' ('per' can mean for each).
'one' becomes 'i' (Roman numeral).
'left' becomes 'l' (common abbreviation).
'per'+'i'+'l'='PERIL'
'for' acts as a link.
(Other definitions for peril that I've seen before include "risk" , "Danger, hazard" , "Quest" , "Exposure to harm" , "Danger, jeopardy" .)