Deposits in the pipeline for piano practice (6)
I believe the answer is:
scales
This clue might be a double definition.
'deposits in the pipeline' is the first definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Maybe there's an association between them I don't understand?
'piano practice' is the second definition.
(I've seen this in another clue)
'for' is the link.
Can you help me to learn more?
(Other definitions for scales that I've seen before include "Flakes of fish skin" , "Libra, Sign of the Zodiac" , "Fish flakes or measuring devices" , "The practice of music" , "a number of small plates" .)