Hard work pursuing computer operating system's browser activity? (6-4)

I believe the answer is:

window-shop

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

'hard work pursuing computer operating system's browser activity?' is the definition.
I can't judge whether this definition defines the answer.

'hard work pursuing computer operating system's' is the wordplay.
'hard' becomes 'h' (abbreviation used in pencil classifications).
'work' becomes 'op' (abbreviation for opus).
'pursuing' means one lot of letters go next to another.
'computer operating system' becomes 'Windows' (operating system by Microsoft).
'h'+'op'='hop'
'hop' put after 'windows' is 'WINDOW-SHOP'.

Can you help me to learn more?

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.