Cryptic crossword clue
Horseman with lance, not the first person unseating someone 6

The most common and most likely answer to this crossword clue is the 6 letter word OUSTER

I've seen this crossword clue in The Times
O
U
S
T
E
R


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The straight part
We know that "person unseating someone" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case person unseating someone = ouster.
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 OUSTER mean?

OUSTER noun
  1. A putting out of possession; dispossession; ejection.
  2. Action by a cotenant that prevents another cotenant from enjoying the use of jointly owned property.
  3. Specifically, the forceful removal of a politician or regime from power; coup.
OUSTER verb
  1. To oust.
OUSTER noun
  1. Someone who ousts.

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