Search for hidden objects (8,4)
I believe the answer is:
treasure hunt
'search for hidden objects' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for treasure hunt that I've seen before include "Game where players try to find things by following a series of clues" , "Search conducted at children's birthday parties" , "Search for stored wealth" , "Children's party game where things are sought" , "possible rally activity" .)