The most common and most likely answer to this crossword clue is the 10 letter word INORDINATE
I've seen this crossword clue in The Daily Telegraph
I
N
O
R
D
I
N
A
T
E
More clues leading to the result INORDINATE
- At home, clatter interrupting discourse is excessive
- Extraordinary rendition transporting a suspect
- Rebellious press worker dismissed as excessive
- Big edition ran spread
- Excessive noise in spout adjoining home
- Great home, inspector having decorated outside
- Over the top and defiant when sub gets dropped
- Develop a rendition that’s OTT
- A rendition becoming excessive
- Ration Enid distributed is excessive
Buddy explains!

The straight part
We know that "Over the top" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case over the top = inordinate.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 INORDINATE mean?
INORDINATE adjective- Excessive; unreasonable or inappropriate in magnitude; extreme.