The most common and most likely answer to this crossword clue is the 9 letter word DETERMINE
I've seen this crossword clue in Financial Times
D
E
T
E
R
M
I
N
E
More clues leading to the result DETERMINE
- Decide to turn off before quarry, possibly
- Discourage Cyclops’s resolve
- Word in cryptic I need to find out
- Discourage writer’s resolve
- Decide to turn off ahead of pit
- Establish what belongs to me as supporter of the Queen after Edward retires
- Fix Irish father up with fur
- Sounds expensive to maintain the earliest pit in Settle
- Fix note to end of Coleridge’s rime: “… then wander without horse”
- Decide to stop on my own
Buddy explains!

The straight part
We know that "resolve" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case resolve = determine.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 DETERMINE mean?
DETERMINE verb- To set the boundaries or limits of.
- To ascertain definitely; to figure out, find out, or conclude by analyzing, calculating, or investigating.
- To fix the form or character of; to shape; to prescribe imperatively; to regulate; to settle.
- To fix the course of; to impel and direct; with a remoter object preceded by to.
- To bring to a conclusion, as a question or controversy; to settle authoritative or judicial sentence; to decide.
- To resolve on; to have a fixed intention of; also, to cause to come to a conclusion or decision; to lead.
- To define or limit by adding a differentia.
- To bring to an end; to finish.