The most common and most likely answer to this crossword clue is the 2 plus 3 plus 7 letter word ON THE REBOUND
I've seen this crossword clue in The Daily Telegraph
O
N
T
H
E
R
E
B
O
U
N
D
More clues leading to the result ON THE REBOUND
Buddy explains!
The straight part
We know that "one may be this" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one may be this = on the rebound.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.