X is embraced by King Charles finally (4)
I believe the answer is:
kiss
'x' is the definition.
(X can represent a kiss)
'is embraced by king charles finally' is the wordplay.
'embraced by' is an insertion indicator.
'king' becomes 'k' (abbreviation for king in chess).
'finally' suggests the final letters.
The final letter of 'charles' is 's'.
'k'+'s'='ks'
'is' going into 'ks' is 'KISS'.
(Other definitions for kiss that I've seen before include "Peck (on cheek or lips?)" , "Gentle touch of the lips" , "Press the lips against" , "lightness of touch?" , "Caress with lips" .)