Crossword Genius

Pope cries out for sub's viewer (9)

Ross

I believe the answer is:

periscope

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

'sub's viewer' is the definition.
'periscope' can be an answer for 'viewer' (I've seen this before). I am not certain of the 'sub's' bit.

'pope cries out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'pope'+'cries'='popecries'
'popecries' with letters rearranged gives 'PERISCOPE'.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for periscope that I've seen before include "Viewing instrument in a submarine" , "Submarine's viewer" , "overseer" , "Sub's eye?" , "Optical instrument" .)

I've seen this clue in the Sydney Morning Herald.
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