Weapons stock in farm our youngsters uncovered (7)
I believe the answer is:
armoury
'weapons stock' is the definition.
'farm our youngsters uncovered' is the wordplay.
'uncovered' says the answer is hidden in the clue.
'ARMOURY' is hidden within 'farm our youngsters'.
'in' acts as a link.
(Other definitions for armoury that I've seen before include "Means" , "Ordnance depot" , "Where weapons are kept" , "All the weapons and equipment" , "Weapon store" .)