Tap into reservoir, rig a terminal to get water (8)

I believe the answer is:

irrigate

I'm a little stuck... Click here to teach me more about this clue!

'water' is the definition.
(I know that water can be written as irrigate)

'tap into reservoir rig a terminal to' is the wordplay.
'IRRIGATE' is hidden within the letters.
But, I am not sure how this is indicated.

'get' is the link.

Can you help me to learn more?

(Other definitions for irrigate that I've seen before include "Water land to increase its fertility" , "Bring water to land" , "Water land to stimulate growth" , "Supply water to fields etc" , "Provide water artificially" .)

I've seen this clue in The Telegraph.

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