Removing application with bug is best (4,5)
I believe the answer is:
cold cream
'removing application' is the definition.
I can't judge whether this defines the answer.
'with bug is best' is the wordplay.
'with' is a charade indicator (letters next to each other).
'bug' becomes 'cold' (I can't justify this - if you can you should believe this answer much more).
'is best' becomes 'cream' (as in 'the cream of the crop').
'cold'+'cream' is 'COLD-CREAM'.
Can you help me to learn more?
(Other definitions for cold cream that I've seen before include "moisturiser" , "Cosmetic preparation" , "Ointment used for softening and cleansing the skin" , "agent aiming to hide wrinkles" , "Cosmetic skin ointment" .)