Crossword Genius

Establish connection school in Karachi uses (4)

Ross

I believe the answer is:

link

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

'establish' is the definition.
The answer and definition can be both related to thinking as well as being verbs in their base form.
Maybe there's a link between them I don't understand?

'connection school in karachi uses' is the wordplay.
'LINK' is hidden in amongst the letters.
But, I'm uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for link that I've seen before include "Physically join" , "Connexion" , "Tie-up" , "Chain component" , "Join together" .)

I've seen this clue in The Telegraph.
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