Under cover when exhibited, as a precaution (2,4)

I believe the answer is:

in case

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

'as a precaution' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for in case that I've seen before include "As a precaution" , "For fear that" , "In order to allow for eventualities" , "Packed" , "Where traveller may keep clothes" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app