Cryptic crossword clue
If under pressure, get going again 9

The most common and most likely answer to this crossword clue is the 9 letter word PRESUMING

I've seen this crossword clue in The Guardian
P
R
E
S
U
M
I
N
G

Buddy explains!

The straight part
We know that "If" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case if = presuming.
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 PRESUMING mean?

PRESUMING verb
  1. With infinitive object: to be so presumptuous as (to do something) without proper authority or permission.
  2. To perform, do (something) without authority; to lay claim to without permission.
  3. To assume or suggest to be true (without proof); to take for granted, to suppose.
  4. To be presumptuous; with on, upon, to take advantage (of), to take liberties (with).
PRESUMING adjective
  1. Confidently or arrogantly overstepping reasonable bounds.

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