Furious about apparatus in water (8)
I believe the answer is:
irrigate
'water' is the definition.
('irrigate' can be a synonym of 'water')
'furious about apparatus' is the wordplay.
'furious' becomes 'irate' (I've seen this before).
'about' indicates putting letters inside.
'apparatus' becomes 'rig' (I've seen this before).
'irate' enclosing 'rig' is 'IRRIGATE'.
'in' acts as a link.
(Other definitions for irrigate that I've seen before include "Water land to increase its fertility" , "Artificially supply land with water" , "Spray" , "Water land by means of ditches etc" , "Supply water to fields etc" .)