The most common and most likely answer to this crossword clue is the 12 letter word CATCHÂ PHRASE
I've seen this crossword clue in The Guardian
C
A
T
C
H
Â
P
H
R
A
S
E
Buddy explains!

The straight part
We know that "Just like that, perhaps" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case just like that, perhaps = catch phrase.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 CATCHÂ PHRASE mean?
CATCHÂ PHRASE noun- A group of words, often originating in popular culture that is spontaneously popularized after widespread repeated use.
- A signature phrase of a particular person or group.