The most common and most likely answer to this crossword clue is the 6 letter word HEALTH
H
E
A
L
T
H
More clues leading to the result HEALTH
- Bit of toast that's often good to begin with
- PM once squeezed large Whitehall department
- Merkel finally probing former prime minister’s fitness
- Fitness of line in open ground
- See 12ac
- Condition of student found in open countryside
- Left in open country, one often gets drunk
- Condition in full finally accepted by PM
- Soundness of Tory PM holding line
- Sound condition of pound protected by PM once
Buddy explains!

The straight part
We know that "in good" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in good = health.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 HEALTH mean?
HEALTH noun- The state of being free from physical or psychological disease, illness, or malfunction; wellness.
- A state of well-being or balance, often physical but sometimes also mental and social; the overall level of function of an organism from the cellular (micro) level to the social (macro) level.
- Physical condition.
- Cure, remedy.
- A toast to prosperity.
- The amount of damage an in-game object can withstand before it is destroyed.
- A warrior; hero; man.