Small gap to patch in kitchen passage (5)

I believe the answer is:

chink

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

'passage' is the definition.
(thesaurus)

'small gap to patch in kitchen' is the wordplay.
'CHINK' is hidden within the letters.
However, I am uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for chink that I've seen before include "Narrow opening, perhaps in armour" , "Narrow crack" .)

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

Want a hint initially instead of a full solution? Install my app