The most common and most likely answer to this crossword clue is the 4 plus 4 letter word TAKE THAT
I've seen this crossword clue in Independent
T
A
K
E
T
H
A
T
More clues leading to the result TAKE THAT
- A single released by man in rubbish pop group
- Pop group try this punch?
- Exclamation made by one hitting another in pop group?
- Pop band appreciated fifty per cent off jacket and headwear
- Steal which band?
- So there is a group of singers
- Don’t get hold of THIS old group
- and 25d What may be said after hit for pop band?
- Opinion given on ragged material encapsulating hard musical group
Buddy explains!

The straight part
We know that "Pop group/try this punch?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pop group/try this punch? = take that.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.