The most common and most likely answer to this crossword clue is the 7 plus 8 letter word HACKNEY CARRIAGE
H
A
C
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C
A
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More clues leading to the result HACKNEY CARRIAGE
- Taxi, one involved in East London drivers’ spat?
- Journalist, eager in cry, managed to catch a cab
- Yesteryear’s vehicle could be creaking car, yeah?
- Taxi transferring Kay reaching race
- ‘London Taxi’, sorry horse, grey — in a race, nobbled
- Good grey chicken are getting transported by car
- Taxi cut the old knight up with attitude
Buddy explains!

The straight part
We know that "cab" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cab = hackney carriage.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.