A connect wall is a 4 x 4 grid, Each has 16 words inside it. They are broken into 4 groups of four words, Each has a relationship. The four words defining the relations are themselves related, And the relations are defined by a single word as well. More information on Stiv's excellent post.
Here is the connect wall:
COMPUTER is not one of the groups.
The answer is relatively crunchy, says the title
ADVOCATE and WINNER are in the same group. CAPACITY is not in the group where VINDICATOR is. BRAIN is not in the group where ALLY is.
If you want to lead to the answer, just go zig-zag. (not the method but this is a hint okay)