The smallest amount give a high-pitched cry (6)
I believe the answer is:
squeak
'high-pitched cry' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for squeak that I've seen before include "(Succeed by) a narrow margin" , "Pip's partner -- quakes (anag)" , "Short high-pitched cry as of bat" , "'High-pitched, screeching noise (6)'" , "Short, high-pitched noise" .)