The most common and most likely answer to this crossword clue is the 7 letter word RAGFAIR
R
A
G
F
A
I
R
Buddy explains!
The straight part
We know that "One’s in RAF rig being given a going over?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one’s in raf rig being given a going over? = ragfair.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.