The most common and most likely answer to this crossword clue is the 2 plus 1 plus 4 letter word ON A ROLL
I've seen this crossword clue in Financial Times
O
N
A
R
O
L
L
More clues leading to the result ON A ROLL
- Where to record members in good form?
- With continuing success, have jam here?
- Marge might go here, being successful
- Being extremely jammy, maybe, spread may be smeared thus
- Where butter may be found in the groove
- Oran, amazingly yet to lose
- Where the ham may be enjoying a run of success?
- Continued good luck when riding a cycle
- Registered winning
- Retired councillor – a non-gambler – keeps having repeated wins
Buddy explains!

The straight part
We know that "Enjoying good luck" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case enjoying good luck = on a roll.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.