Answer:

knowsonesonions

Answer	Crossword Clue
KNOWSONESONIONS	Has proficiency, slangily
KNOWSONESONIONS	Is well-versed in a subject
KNOWSONESONIONS	Has expertise

KNOWSONESONIONS	Is proficient
KNOWSONESONIONS	Is highly skilled: Slang.
KNOWSONESONIONS	Identifies certain grocery items.
KNOWSONESONIONS	Is adept
KNOWSONESONIONS	Is a pro
KNOWSONESONIONS	Has the material mastered
KNOWSONESONIONS	Is highly versed about something