The most common and most likely answer to this crossword clue is the 4 letter word WARE
W
A
R
E
More clues leading to the result WARE
Buddy explains!

The straight part
We know that "Good" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case good = ware.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 WARE mean?
WARE noun- The state of being aware; heed.
- Aware.
- (usually in combination) Goods or a type of goods offered for sale or use.
- (in the plural) See wares.
- Pottery or metal goods.
- A style or genre of artifact.
- Crockery.
- To be ware or mindful of something.
- To protect or guard (especially oneself); to be on guard, be wary.
- Wary; cautious.
- Seaweed.
- To wear, or veer.