Parts of a fish used for balance (6)
I believe the answer is:
scales
This might be a double definition.
'parts of a fish' is the first definition.
The answer and definition can be both man-made objects as well as being plural nouns.
I also know that 'fish' relates to this answer.
'for balance' is the second definition.
(balance can mean a set of scales)
'used' is the link.
Can you help me to learn more?
(Other definitions for scales that I've seen before include "Weighting machines - Sign of Libra" , "Weighing devices or fish flakes" , "The practice of music" , "Removes plaque" , "Climbs the weight measuring device" .)