Drunk in Ostend? (6)

I believe the answer is:

stoned

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

'drunk' is the definition.
(I've seen this before)

'ostend?' is the wordplay.
'ostend' anagrams to 'STONED'.
But, I'm not clear how the anagram is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for stoned that I've seen before include "Plastered" , "Slangily drunk or pelted with rocks" , "High; intoxicated" , "Incapable from drug-taking" , "Are cherries so" .)

I've seen this clue in the Evening Standard.

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