The most common and most likely answer to this crossword clue is the 3 plus 4 letter word AIR TAXI
I've seen this crossword clue in The Guardian
A
I
R
T
A
X
I
More clues leading to the result AIR TAXI
- Display burden on one vehicle
- Once Victor’s taken off aviatrix could be flying this
- Carriage? Are demanding one for transport
- One's flown commercially in a US sitcom shown across Ireland
- Fix a trial involving rising winger for hire
- Aviatrix, very briefly flying, ordered for this transport?
- Fix a trial that’s holding up carrier
- Chopper for hire? Chopper, independent, following direction to Scotland
- A train, not new, shifted on side as transport
- Flying cab?
Buddy explains!

The straight part
We know that "carrier" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case carrier = air taxi.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.