The most common and most likely answer to this crossword clue is the 8 letter word TURN-UPS
I've seen this crossword clue in Financial Times
T
U
R
N
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U
P
S
More clues leading to the result TURN-UPS
Buddy explains!
The straight part
We know that "Surprises/that come with some trousers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case surprises/that come with some trousers = turn-ups.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 TURN-UPS mean?
TURN-UPS noun- Fabric turned up at the bottom of trousers to make them shorter.
- A fight or disturbance.
- The next card taken from the top of a pack of cards and displayed.
- A stroke of good luck; something that appears unexpectedly; especially in turn up for the book.