The most common and most likely answer to this crossword clue is the 4 plus 3 letter word ROAD HOG
R
O
A
D
H
O
G
More clues leading to the result ROAD HOG
- Aggressive driver got a piggyback I hear!
- One away from hedge on tarmac, squashed by this inconsiderate type
- Terrible driver takes zero notice cutting right hand turn going north
- Terribly hard when negotiating roundabout to pass around … him?
- Hairy traveller? Good hair, sadly, I may be lacking
- Bad driver had crashed, having run rings around good
- Selfish type in an estate?
- Piggy in the middle?
- Travelled on unlikely flier, we hear — one making the journey difficult
- Reckless driver smashed a door hard against edge of gutter
Buddy explains!

The straight part
We know that "Terribly hard when negotiating roundabout to pass around … him" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case terribly hard when negotiating roundabout to pass around … him = road hog.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.