Out of repair, rig a technical means to supply water (8)
I believe the answer is:
irrigate
'water' is the definition.
('irrigate' can be a synonym of 'water')
'out of repair rig a technical means' is the wordplay.
'out of' indicates the answer is hidden within the clue.
'IRRIGATE' is hidden in the letters of 'repair rig a technical means'.
'to supply' is the link.
(Other definitions for irrigate that I've seen before include "Artificially supply land with water" , "Bring water to (crops)" , "Supply water to land to help growth" , "Supply water to fields etc" , "Provide water artificially" .)