The most common and most likely answer to this crossword clue is the 2 plus 3 plus 4 letter word ON THE TROT
I've seen this crossword clue in Financial Times
O
N
T
H
E
T
R
O
T
More clues leading to the result ON THE TROT
- Cook not happy at first with cake knocked over in a row
- Running north to east though not as tricky
- Liquid hotter — not running
- Moving at a fairly fast paceu, or running
- Running article by extremist in a row
- Hot tenor getting angry and tense in a row
- Busy male going in August, perhaps wrong to return south of Spain
- How it is when a left-winger pays repeatedly?
- Supported by article, left-winger’s in a row
- Like a horse ride without a break?
Buddy explains!
The straight part
We know that "Busy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case busy = on the trot.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.