Spider window-shopping for an internet essential? (3,7)

I believe the answer is:

web browser

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'spider window-shopping' is the definition.
I know nothing about this answer so I can't judge whether this works.

'an internet essential?' is the wordplay.
'an internet' becomes 'web' (I've seen this in another clue).
'essential?' becomes 'browser' (I can't justify this - if you can you should believe this answer much more).
'web'+'browser'='WEB BROWSER'

'for' is the link.

Can you help me to learn more?

(Other definitions for web browser that I've seen before include "Program allowing access to internet pages" , "Safari, perhaps" , "Safari, for example" , "Navigation aid" , "Computer facility" .)

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

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