Scrambled to dress light (7)
I believe the answer is:
garbled
'scrambled' is the definition.
(thesaurus)
'dress light' is the wordplay.
'dress' becomes 'garb' (synonyms).
'light' becomes 'led' (abbreviation for light emitting diode).
'garb'+'led'='GARBLED'
'to' acts as a link.
(Other definitions for garbled that I've seen before include "Confused, disjointed" , "Distorted - muddled" , "Disjointed, incoherent" , "Distorted, confused" , "Unintentionally jumbled" .)