Cryptic crossword clue
Start working in the AA, entering Institute 12

The most common and most likely answer to this crossword clue is the 12 letter word FOUNTAINHEAD

F
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Buddy explains!

The straight part
We know that "Start" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case start = fountainhead.
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 FOUNTAINHEAD mean?

FOUNTAINHEAD noun
  1. A spring that is the source of a river.
  2. An abundant source of knowledge, etc.

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