Do the same and put a kiss on the top (4)
I believe the answer is:
apex
'the top' is the definition.
(I've seen this before)
'do the same' is the wordplay.
'do' becomes 'ape' (both can mean to impersonate).
'the same' becomes 'x' (I can't justify this - if you can you should give a lot more credence to this answer).
'ape'+'x'='APEX'
'and put a kiss on' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for apex that I've seen before include "reasonable fare" , "Top point" , "crown" , "The highest point or pointed end" , "Culmination" .)