Superficial need to be thrown into large bin (4-4)
I believe the answer is:
skin-deep
'superficial' is the definition.
(I've seen this before)
'need to be thrown into large bin' is the wordplay.
'to be thrown' indicates an anagram (I've seen 'was thrown' mean this).
'into' is an insertion indicator.
'large bin' becomes 'skip' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'need' is an anagram of 'ndee'.
'ndee' inserted inside 'skip' is 'SKIN-DEEP'.
Can you help me to learn more?
(Other definitions for skin-deep that I've seen before include "Develop" , "Stringed instrument" , "The depth of beauty" , "Superficial, beauty perhaps" , "Superficial as beauty is said to be" .)