The most common and most likely answer to this crossword clue is the 10 letter word INFLATABLE
I've seen this crossword clue in The Daily Telegraph
I
N
F
L
A
T
A
B
L
E
Buddy explains!

The straight part
We know that "that can be blown up" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case that can be blown up = inflatable.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 INFLATABLE mean?
INFLATABLE noun- A boat or dinghy that may be inflated when needed.
- Any other structure, artwork etc. that is inflated.
- Able to be inflated or blown up.