Tablet dad found amongst papers (4)
I believe the answer is:
ipad
'tablet' is the definition.
(tablet made by Apple)
'dad found amongst papers' is the wordplay.
'dad' becomes 'pa' (both can mean one's father).
'found amongst' means one lot of letters goes inside another (inserted letters are placed amongst others).
'papers' becomes 'ID' (identifying documents are one's 'papers').
'pa' put within 'id' is 'IPAD'.
(Other definitions for ipad that I've seen before include "Small personal computer" , "Tablet computer from Apple" .)