The most common and most likely answer to this crossword clue is the 12 letter word ABBREVIATION
I've seen this crossword clue in The Times
A
B
B
R
E
V
I
A
T
I
O
N
More clues leading to the result ABBREVIATION
- Shortened form of two books about getting into flying industry
- Above Britain, flying for RAF, perhaps
- Curtailment of flying above Britain
- The EU for instance is potentially above Britain
- Cutting books on the subject of getting into flying
- Lettered representative such as MP, AM, MLA or MSP?
- RAF perhaps flying around Belgium and Borneo occasionally
- Book twice to meet nucleus of crew in operation of aircraft — BA, for example
- E.g. for example?
- RAF, for example, regrouped above Britain
Buddy explains!

The straight part
We know that "RAF, perhaps" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case raf, perhaps = abbreviation.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 ABBREVIATION mean?
ABBREVIATION noun- The result of shortening or reducing; abridgment.
- A shortened or contracted form of a word or phrase, used to represent the whole, utilizing omission of letters, and sometimes substitution of letters, or duplication of initial letters to signify plurality, including signs such as +, =, @.
- The process of abbreviating.
- A notation used in music score to denote a direction, as pp or mf.
- One or more dashes through the stem of a note, dividing it respectively into quavers, semiquavers, demisemiquavers, or hemidemisemiquavers.
- Any convenient short form used as a substitution for an understood or inferred whole.
- Loss during evolution of the final stages of the ancestral ontogenetic pattern.
- Reduction to lower terms, as a fraction.