One associated with trouble involving egg mayonnaise? (5)
I believe the answer is:
aioli
'mayonnaise?' is the definition.
(mayonnaise seasoned with garlic)
'one associated with trouble involving egg' is the wordplay.
'one' becomes 'i' (Roman numeral).
'associated with' means one lot of letters go next to another.
'trouble' becomes 'ail' (synonyms).
'involving' indicates putting letters inside.
'egg' becomes 'o' (an 'o' resembles an egg).
'ail' going around 'o' is 'aiol'.
'i' after 'aiol' is 'AIOLI'.
(Other definitions for aioli that I've seen before include "Mayo, in part?" , "Garnish" , "mayonniase" , "Garlic-flavoured mayonnaise" , "garlic sauce" .)