River Test suitable for plant (10)
I believe the answer is:
industrial
'river test suitable for plant' is the definition.
I can't tell whether this defines the answer.
'river test' is the wordplay.
'river' becomes 'indus' (Indian river).
'test' becomes 'trial' (synonyms).
'indus'+'trial'='INDUSTRIAL'
Can you help me to learn more?
(Other definitions for industrial that I've seen before include "plants may be so described" , "Characterised by manufacturing processes" , "fabricating things?" , "Involved in manufacture" , "Relating to manufacture" .)