Dangerous situation with no power for illumination (5)
I believe the answer is:
light
'illumination' is the definition.
(light is a kind of illumination)
'dangerous situation with no power' is the wordplay.
'dangerous situation' becomes 'plight' (I've seen this before).
'with no' suggests deleting specific letters.
'power' becomes 'p'.
'plight' with 'p' removed is 'LIGHT'.
'for' is the link.
(Other definitions for light that I've seen before include "Frivolous -- insubstantial" , "Pre-eminent person; window" , "Opposite of dark" , "Undemanding; crossword answer" , "free gift from The Sun" .)