Water crops (8)
I believe the answer is:
irrigate
'water crops' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for irrigate that I've seen before include "Supply land with a constant flow of water" , "Provide (agricultural land) with water" , "Artificially supply land with water" , "Bring water to (crops)" , "Pour water on" .)