Cryptic crossword clue
Crowd puller – transformation of cat into rat 10

The most common and most likely answer to this crossword clue is the 10 letter word ATTRACTION

I've seen this crossword clue in Financial Times
A
T
T
R
A
C
T
I
O
N

Buddy explains!

The straight part
We know that "Crowd puller" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case crowd puller = attraction.
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 ATTRACTION mean?

ATTRACTION noun
  1. The tendency to attract.
  2. The feeling of being attracted.
  3. An event, location, or business that has a tendency to draw interest from visitors, and in many cases, local residents.
  4. The sacrifice of pieces in order to expose the enemy king.

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