Crossword Genius

Impenetrable island shelters right criminal (8)

Ross

I believe the answer is:

airtight

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

'island shelters right criminal' is the wordplay.
'island' becomes 'ait' (I've seen this before).
'shelters' means one lot of letters goes inside another.
'criminal' indicates an anagram.
'right' anagrammed gives 'rtigh'.
'ait' placed around 'rtigh' is 'AIRTIGHT'.

(Other definitions for airtight that I've seen before include "Sure" , "Without weak points" , "Firmly closed" , "Not allowing gas to enter or escape" , "(Of a defence) having no weaknesses" .)

I've seen this clue in The Independent.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.