Slightly charming son leaves ego at home (5)

I believe the answer is:

elfin

I'm a little stuck... Click here to teach me more about this clue!

'slightly charming' is the definition.
'elfin' can be an answer for 'charming' (I've seen this before). I am not sure about the 'slightly' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for elfin that I've seen before include "Mischievous sprite" , "Sweet" , "Delicately framed" , "Like a little fairy" , "Fairy-like" .)

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.