The most common and most likely answer to this crossword clue is the 11 letter word SUGGESTIONS
I've seen this crossword clue in The Daily Telegraph
S
U
G
G
E
S
T
I
O
N
S
Buddy explains!
The straight part
We know that "Thinking outside the box may lead to these inside it" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case thinking outside the box may lead to these inside it = suggestions.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 SUGGESTIONS mean?
SUGGESTIONS noun- Something suggested (with subsequent adposition being for)
- The act of suggesting.
- Something implied, which the mind is liable to take as fact.
- The act of exercising control over a hypnotised subject by communicating some belief or impulse by means of words or gestures; the idea so suggested.
- Information, insinuation, speculation, as opposed to a sworn testimony and evidence