Shallow type in drip (4-4)
I believe the answer is:
skin-deep
'shallow' is the definition.
(I've seen this before)
'type in drip' is the wordplay.
'type' becomes 'kind' (I've seen this in another clue).
'in' is an insertion indicator.
'drip' becomes 'seep' (I am not sure about this - if you are sure you should believe this answer much more).
'kind' placed into 'seep' is 'SKIN-DEEP'.
Can you help me to learn more?
(Other definitions for skin-deep that I've seen before include "Superficial, barely penetrating" , "Superficial, beauty perhaps" , "Develop" , "Superficial (like beauty?)" , "Stringed instrument" .)