Cleans broken tip of prism - it protects your camera (4,3)

I believe the answer is:

lens cap

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'it protects your camera' is the definition.
The definition suggests a singular noun which matches the answer.

'cleans broken tip of prism' is the wordplay.
'broken' is an anagram indicator.
'tip of' indicates taking the first letters.
The first letter of 'prism' is 'p'.
'cleans' with letters rearranged gives 'lensca'.
'lensca'+'p'='LENS CAP'

Can you help me to learn more?

(Other definitions for lens cap that I've seen before include "protection for photographer" , "Aperture protector" , "Camera cover" .)

I've seen this clue in The Irish Times.

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