See face of lunatic that slays me (3)

I believe the answer is:

lol

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

'slays me' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'see face of lunatic' is the wordplay.
'see' becomes 'lo' (archaic exclamation meaning 'look!').
'face of' suggests taking the first letters.
The first letter of 'lunatic' is 'l'.
'lo'+'l'='LOL'

'that' is the link.

Can you help me to learn more?

(Other definitions for lol that I've seen before include "so funny online!" , "Very funny (1)" .)

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