Don't go to expert to cover new floor (4,3)
I believe the answer is:
bunk off
'don't go' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'expert to cover new floor' is the wordplay.
'expert' becomes 'buff' (I've seen this before).
'to cover' means one lot of letters goes inside another.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'floor' becomes 'ko' (I've seen this in other clues).
'n'+'ko'='nko'
'buff' enclosing 'nko' is 'BUNK OFF'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for bunk off that I've seen before include "Play truant" , "Abscond (from school)" .)