Garment making water heater fit (10)
I believe the answer is:
boilersuit
'garment' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?
'water heater fit' is the wordplay.
'water heater' becomes 'boiler' (I've seen this before).
'fit' becomes 'suit' (synonyms).
'boiler'+'suit'='BOILERSUIT'
'making' acts as a link.
Can you help me to learn more?
(Another definition for boilersuit that I've seen is " Overalls".)