The most common and most likely answer to this crossword clue is the 10 letter word RINGMASTER
I've seen this crossword clue in The Daily Telegraph
R
I
N
G
M
A
S
T
E
R
More clues leading to the result RINGMASTER
- MC in circus starring me doing acrobatics
- Director of a circus that’s starring … me, surprisingly
- His audience requests Send in the Clowns
- Telephone a teacher – he’ll crack the whip!
- Mum has rest disrupted by call from big top manager
- Top man in Omaha briefly
- Skipper’s on call, being top manager
- See me starring with a whip?
- Host needs to call maiden back, having been cut off prematurely
- Presenter of show in the round starring me in new production
Buddy explains!

The straight part
We know that "top manager" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case top manager = ringmaster.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 RINGMASTER mean?
RINGMASTER noun- The person who manages the performers in a circus ring.
- To act as ringmaster.
- To control (a group of people).