Reportedly, a condiment that might be common (7)
I believe the answer is:
assault
'common' is the definition.
Both the answer and definition are adjectives. Perhaps you can see an association between them that I don't see?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for assault that I've seen before include "Sort of course" , "raid" , "Sudden violent attack" , "Launch an attack on" , "Attack suddenly" .)