Crossword Genius

Hiding when they're carrying out a security check (9)

Ross

I believe the answer is:

screening

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

'hiding' is the definition.
(I know that screening is a type of hiding)

'they're carrying out a security check' is the wordplay.
I cannot really see how this works, but
'check' could be 'screen' (synonyms) and 'screen' is present in the answer.
This explanation may well be incorrect...

'when' acts as a link.

Can you help me to learn more?

(Other definitions for screening that I've seen before include "broadcast" , "Showing (of a film)" .)

I've seen this clue in the Evening Standard.
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