The most common and most likely answer to this crossword clue is the 7 letter word IMPRESS
I've seen this crossword clue in The Times
I
M
P
R
E
S
S
More clues leading to the result IMPRESS
- Current female ruler's topless — wow!
- Remark made by journalist to create an impact?
- Remark made by journalist, perhaps, to produce an effect
- Influence of one million crowd
- One voting system in chaos, make one's mark
- Grab mischievous child on ship
- Journalist's announcement to create awe
- Wow, my job is reporting for the FT?
- Journalist’s self-introduction to make a stir
- Wow! Current ruler drops ecstasy
Buddy explains!

The straight part
We know that "to create an impact" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case to create an impact = impress.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.
What does IMPRESS mean?
IMPRESS noun- The act of impressing.
- An impression; an impressed image or copy of something.
- A stamp or seal used to make an impression.
- An impression on the mind, imagination etc.
- Characteristic; mark of distinction; stamp.
- A heraldic device; an impresa.
- The act of impressing, or taking by force for the public service; compulsion to serve; also, that which is impressed.
- To affect (someone) strongly and often favourably.
- To make an impression, to be impressive.
- To produce a vivid impression of (something).
- To mark or stamp (something) using pressure.
- To produce (a mark, stamp, image, etc.); to imprint (a mark or figure upon something).
- To fix deeply in the mind; to present forcibly to the attention, etc.; to imprint; to inculcate.
- To compel (someone) to serve in a military force.
- To seize or confiscate (property) by force.