Stockpile great crowd heard of (5)
I believe the answer is:
hoard
'stockpile' is the definition.
(I've seen this before)
'great crowd heard of' is the wordplay.
'great crowd' becomes 'horde' (I've seen this before).
'heard of' shows a homophone (sound like).
'horde' sounds like 'HOARD'.
(Other definitions for hoard that I've seen before include "(Miser's) store" , "Accumulated store" , "Cache" , "Secret store of valuables" , "Squirrel away" .)