Supply (land) with water (8)

I believe the answer is:

irrigate

(Other definitions for irrigate that I've seen before include "Provide (agricultural land) with water" , "Provide water to (crops)" , "Water land by means of ditches etc" , "Bring water to (crops)" , "Water land to increase its fertility" .)

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.