Apparatus or equipment used in irrigation (3)

I believe the answer is:

rig

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

'apparatus' is the definition.
(I've seen this before)

'equipment used in irrigation' is the wordplay.
'RIG' is hidden in amongst the letters.
However, I am unsure how the hidden word is indicated.

'or' acts as a link.

Can you help me to learn more?

(Other definitions for rig that I've seen before include "Manage or control fraudulently, say an election" , "Fit with sails and tackling" , "Fix; equip" , "Equipment for drilling oil well" , "Arrange the outcome of by means of deceit" .)

I've seen this clue in the Evening Standard.

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