Pass the best moisturiser (4,5)
I believe the answer is:
cold cream
'moisturiser' is the definition.
(I've seen this before)
'pass the best' is the wordplay.
'pass' becomes 'cold' (I can't justify this - if you can you should believe this answer much more).
'the best' becomes 'cream' (as in 'the cream of the crop').
'cold'+'cream'='COLD-CREAM'
Can you help me to learn more?
(Other definitions for cold cream that I've seen before include "agent aiming to hide wrinkles" , "Cleansing cosmetic" , "Ointment used for softening and cleansing the skin" , "Cosmetic preparation" , "Skin softener and cleanser" .)