Early, perhaps, to be so advanced? (4)
I believe the answer is:
soon
'early' is the definition.
(I've seen this in other clues)
'to be so advanced?' is the wordplay.
'to be so' becomes 'so'.
'advanced?' becomes 'on' (I can't justify this - if you can you should believe this answer much more).
'so'+'on'='SOON'
'perhaps' is the link.
Can you help me to learn more?
(Other definitions for soon that I've seen before include "In a little while" , "Willingly" , "Before long" , "Shortly" , "Before you can say Jack Robinson" .)