The most common and most likely answer to this crossword clue is the 8 letter word HISPANIC
H
I
S
P
A
N
I
C
More clues leading to the result HISPANIC
- Iberian: what brought about a state of agitation for him?
- Latin American – what alarms him?
- Argentinian perhaps showing her composure? Quite the opposite!
- The man’s fear is to do with Spain
- Mexican perhaps — what made him get agitated?
- Man’s fear of Latin?
- The man’s agitation seeing Jennifer Lopez, for example
- Iberian geezer’s a grass
- The man’s fear of Spain
- Spanish chronicle— terror forces conservative out
Buddy explains!

The straight part
We know that "Iberian" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case iberian = hispanic.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.