The most common and most likely answer to this crossword clue is the 4 letter word SKYR
I've seen this crossword clue in The Guardian
S
K
Y
R
More clues leading to the result SKYR
Buddy explains!
The straight part
We know that "cheesy stuff" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cheesy stuff = skyr.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 SKYR mean?
SKYR noun- A yogurt-like product made of curdled milk, curds stored up for food; a thick dairy product unique to Icelandic cuisine that can be traced back to the Vikings.