The most common and most likely answer to this crossword clue is the 4 letter word TONK
I've seen this crossword clue in Financial Times
T
O
N
K
Buddy explains!

The straight part
We know that "strike" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case strike = tonk.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 TONK mean?
TONK noun- An illegal immigrant of any country.
- An item of value, or of perceived value, especially for sale.
- A matching card game, combining features of knock rummy and conquian.
- A tank.
- To knock or strike (a ball) so that it flies through the air.