The most common and most likely answer to this crossword clue is the 11 letter word RECONNOITRE
I've seen this crossword clue in Financial Times
R
E
C
O
N
N
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I
T
R
E
More clues leading to the result RECONNOITRE
Buddy explains!

The straight part
We know that "explore" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case explore = reconnoitre.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 RECONNOITRE mean?
RECONNOITRE noun- An act or instance of reconnoitring.
- To perform a reconnaissance (of an area; an enemy position); to scout with the aim of gaining information.
- To recognise.