The most common and most likely answer to this crossword clue is the 7 letter word SLOGANS
I've seen this crossword clue in The Daily Telegraph
S
L
O
G
A
N
S
More clues leading to the result SLOGANS
Buddy explains!
The straight part
We know that "Catchy phrases" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case catchy phrases = slogans.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 SLOGANS mean?
SLOGANS noun- A catch phrase associated with the product or service being advertised.
- A distinctive phrase of a person or group of people.
- A battle cry among the ancient highlanders of Scotland.