The most common and most likely answer to this crossword clue is the 7 letter word OUSTING
I've seen this crossword clue in The Guardian
O
U
S
T
I
N
G
More clues leading to the result OUSTING
- Trip carrying spades, toppling
- Displacing son during excursion
- Exclusion from tournament for failure to start
- Getting rid of most of our pain
- Getting rid of tournament competition when first of judges is unavailable
- Squadron leader, some way into trip, ejecting
- Removing son during pleasure trip
- Expelling yobs finally in day trip
- Evicting son admitted into excursion
- Getting rid of head of state during a trip
Buddy explains!

The straight part
We know that "Exclusion/Exclusion" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case exclusion/exclusion = ousting.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 OUSTING mean?
OUSTING verb- To expel; to remove.
- The act by which somebody is ousted.