Crossword Genius

Type of irrigation restricted by protocol on Iceland (7)

Ross

I believe the answer is:

colonic

'type of irrigation' is the definition.
(colonic irrigation cleans the colon)

'restricted by protocol on iceland' is the wordplay.
'restricted by' indicates the answer is hidden within the clue.
'COLONIC' can be found hidden inside 'protocol on iceland'.

(Another definition for colonic that I've seen is " Type of irrigation".)

I've seen this clue in The Telegraph.
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