The most common and most likely answer to this crossword clue is the 5 plus 2 letter word WEIGH IN
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Buddy explains!
The straight part
We know that "jockeys require before race" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case jockeys require before race = weigh in.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 WEIGH IN mean?
WEIGH IN noun- The process of determining a competitor's body weight prior to an event, especially to ensure it is within the weight restrictions.