The most common and most likely answer to this crossword clue is the 7 letter word GO-SLOW
I've seen this crossword clue in The Guardian
G
O
-
S
L
O
W
Buddy explains!

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 GO-SLOW mean?
GO-SLOW noun- A period of time spent in an unusually slow fashion.
- Deliberate slow working as a protest during an industrial dispute.