Not sending through full light? Mains broken, with rest requiring generator (15)

I believe the answer is:

semitransparent

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'not sending through full light?' is the definition.
(something transparent blocks some light)

'mains broken with rest requiring generator' is the wordplay.
'broken with' indicates an anagram.
'requiring generator' becomes 'parent' (I am not sure about this - if you are sure you should believe this answer much more).
'mains' with its letters mixed up with 'rest' makes 'semitrans'.
'semitrans'+'parent'='SEMITRANSPARENT'

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