The most common and most likely answer to this crossword clue is the 7 letter word CLOBBER
I've seen this crossword clue in The Guardian
C
L
O
B
B
E
R
More clues leading to the result CLOBBER
Buddy explains!
The straight part
We know that "Outfit/bash" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case outfit/bash = clobber.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 CLOBBER mean?
CLOBBER noun- A thumping or beating.
- A bash on say the head, typically with a tool or object rather than with fists.
- To hit or bash severely; to seriously harm or damage.
- To overwrite (data) or override (an assignment of a value), often unintentionally or unexpectedly.
- Clothing; clothes.
- Equipment.
- A paste used by shoemakers to hide the cracks in leather.