The most common and most likely answer to this crossword clue is the 6 letter word TENSER
T
E
N
S
E
R
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The straight part
We know that "Under more pressure" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case under more pressure = tenser.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 TENSER mean?
TENSER adjective- Showing signs of stress or strain; not relaxed.
- Pulled taut, without any slack.