The most common and most likely answer to this crossword clue is the 9 letter word COMPETENT
I've seen this crossword clue in Independent
C
O
M
P
E
T
E
N
T
More clues leading to the result COMPETENT
- Able to be a contestant, not losing heart
- . Capable of struggle, not without heart
- “Satisfactory” secondary school getting Ofsted’s fifth X at beginning of term
- Efficient committee man with books
- Sufficiently good to contend with Anita regularly
- Contest over Northern Territory is satisfactory
- Manage to accommodate millions with temporary accommodation that’s satisfactory
- Heartless remark about sweetheart being fit
- Fit rival? Not disheartened
- Able to take part, not having lost heart
Buddy explains!

The straight part
We know that "Sufficiently good" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sufficiently good = competent.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 COMPETENT mean?
COMPETENT adjective- Having sufficient skill, knowledge, ability, or qualifications.
- Having jurisdiction or authority over a particular issue or question.
- Adequate for the purpose
- (of a cell wall) Permeable to foreign DNA.
- Resistant to deformation or flow.