The most common and most likely answer to this crossword clue is the 9 letter word ROADSTERS
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More clues leading to the result ROADSTERS
Buddy explains!

The straight part
We know that "hot rods" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hot rods = roadsters.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 ROADSTERS mean?
ROADSTERS noun- A sea-going vessel riding at anchor in a road or bay.
- A clumsy vessel that works its way from one anchorage to another by means of the tides.
- A horse for riding or driving on the road.
- A bicycle, or tricycle, adapted for common roads, rather than for the racing track, usually of classic style and steel-framed construction.
- One who drives much; a coach driver.
- A hunter who keeps to the roads instead of following the hounds across country.
- An open automobile having a front seat and a rumble seat.
- A person who lives along the road.