CCCWC November competition voters’ comments on Clue no. 10

A clue to SUBMARINE.
4 comments refer to this clue (from 3 competitors, 1 other)

Here is the text

Comments on the clue

1.	I don’t see how a question mark on its own indicates an anagram
2.	Nicely succinct.
3.	you get a point for cheek (literally)!
4.	'?' doesn't indicate an anagram. Could have used 'possibly'?