Some trickle-down reveals basis for assessment (6)
I believe the answer is:
metric
'basis for assessment' is the definition.
I can't judge whether this definition defines the answer.
'some trickle-down reveals' is the wordplay.
'reveals' says the answer is hidden in the clue.
'METRIC' is hidden in the letters of 'some trickle down'.
Can you help me to learn more?
(Other definitions for metric that I've seen before include "Relating to poetic rhythm" , "Consisting of verses; pertaining to one system of measurement" , "System using litre and gram as units" , "Non-Imperial system of measurement" , "Like some feet" .)