Cryptic crossword clue
Rationality was unusually seen in training facility 7,7

The most common and most likely answer to this crossword clue is the 7 plus 7 letter word RAILWAY STATION

I've seen this crossword clue in The Sunday Telegraph
R
A
I
L
W
A
Y
S
T
A
T
I
O
N

Buddy explains!

The straight part
We know that "training facility" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case training facility = railway station.
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.

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