Nothing hard about this pile (5)
I believe the answer is:
hoard
'this pile' is the definition.
(thesaurus)
'nothing hard about' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'about' indicates putting letters inside.
'o' inserted within 'hard' is 'HOARD'.
(Other definitions for hoard that I've seen before include "Amass and store privately" , "Secret store of valuables" , "Reserve supply" , "Stash of treasure" , "(Miser's) store" .)