Web embraces Musk's website - it's succeeding (4)
I believe the answer is:
next
'it's succeeding' is the definition.
(next in a sequence)
'web embraces musk's website' is the wordplay.
'web' becomes 'net' (synonyms).
'embraces' is an insertion indicator.
'musk's website' becomes 'x' (I can't explain this - if you can you should give a lot more credence to this answer).
'net' going around 'x' is 'NEXT'.
Can you help me to learn more?
(Other definitions for next that I've seen before include "Immediately afterwards" , "Subsequent" , "Neighbour lives in the house . . . . door" , "Coming nearest in order - come, please!" , "Following in sequence" .)