Old Tuareg involved in scandal (7)
I believe the answer is:
outrage
'scandal' is the definition.
(synonyms)
'old tuareg involved' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'involved' is an anagram indicator (involved can mean confusing or complex).
'tuareg' with letters rearranged gives 'utrage'.
'o'+'utrage'='OUTRAGE'
'in' is the link.
(Other definitions for outrage that I've seen before include "Profound indignation" , "Shocking event" , "Barbarity" , "To argue about act that shocks public opinion" , "Violate" .)