Keep to yourself, through avoiding every other character (3)
I believe the answer is:
hog
'keep' is the definition.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for hog that I've seen before include "Porker" , "Take greedily" , "Selfishly keep" , "Greedy person or pig for slaughter" , "Domesticated pig" .)