The most common and most likely answer to this crossword clue is the 2 plus 2 letter word OR SO
I've seen this crossword clue in The Guardian
O
R
S
O
More clues leading to the result OR SO
- Sort of headless trunk
- Anything unfinished freeing up tons, approximately
- . Body temperature taken roughly
- Name of famous auteur finally expunged? More or less
- Loves to pinch scientists roughly
- Trunk not to be opened roughly
- Timeless body … ish!
- Film director’s name cut short roughly
- Close to body dropping temperature
- More or less dislodge lid from trunk
Buddy explains!

The straight part
We know that "roughly" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case roughly = or so.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.