The most common and most likely answer to this crossword clue is the 9 letter word EXPEDIENT
I've seen this crossword clue in The Guardian
E
X
P
E
D
I
E
N
T
More clues leading to the result EXPEDIENT
- Suitable former exercise regime any number accepted
- Practical once confined to breathe one’s last inside
- Fitting, this means
- Index Pete devised as means to an end
- Spotted object in old exercise books that’s appropriate
- Sensible partner once getting exercise and new addition to weight loss plan
- Suitable old exercise regimen involving bit of netting
- Once confined, breathe one’s last inside — it’s practical
- Changing the order, I’d pee next as it’s in my best interests
- No longer taking exercise, one in depression needed to get fit
Buddy explains!

The straight part
We know that "Sensible" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sensible = expedient.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 EXPEDIENT mean?
EXPEDIENT noun- A method or means for achieving a particular result, especially when direct or efficient; a resource.
- Suitable to effect some desired end or the purpose intended.
- Affording short-term benefit, often at the expense of the long-term.
- Governed by self-interest, often short-term self-interest.
- Expeditious, quick, rapid.