The most common and most likely answer to this crossword clue is the 7 letter word OCARINA
I've seen this crossword clue in The Times
O
C
A
R
I
N
A
More clues leading to the result OCARINA
- Something that’s blown article inside damaged aircon
- About to come in on air, playing instrument
- Instrument from old motor in top of aeroplane
- Instrument installed in auto, car in Aberystwyth
- Business backing song about new music-maker
- Ring about gunmen casing home, blow it!
- Unusual wind removing walls from local urinal
- Air-con adjusted with a rare instrument
- Instrument installed in radio car in advance
- Instrument fitted to Volvo car in America
Buddy explains!

The straight part
We know that "blow it!" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case blow it! = ocarina.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 OCARINA mean?
OCARINA noun- A woodwind musical instrument that is closed at both sides to produce an enclosed space, and punctured with finger holes.