Cryptic crossword clue
Having a turn, our boss reset obsolete browser 12

The most common and most likely answer to this crossword clue is the 12 letter word BRONTOSAURUS

I've seen this crossword clue in Financial Times
B
R
O
N
T
O
S
A
U
R
U
S

Buddy explains!

The straight part
We know that "obsolete browser" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case obsolete browser = brontosaurus.
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 BRONTOSAURUS mean?

BRONTOSAURUS noun
  1. One of the largest land animals to ever walk the earth; a Brontosaurus.

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