Cryptic crossword clue
Jumper mostly sported at entrance to tyre plant 8

The most common and most likely answer to this crossword clue is the 8 letter word FLEAWORT

I've seen this crossword clue in The Times
F
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A
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Buddy explains!

The straight part
We know that "plant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case plant = fleawort.
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 FLEAWORT mean?

FLEAWORT noun
  1. Any of various unrelated plants that are supposed to kill or ward off fleas.
  2. A herb, Plantago psyllium, whose seeds are supposed to resemble fleas

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