In Zermatt I repack clothes (6)
I believe the answer is:
attire
'clothes' is the definition.
(attire is clothing)
'in zermatt i repack' is the wordplay.
'in' indicates a hidden word.
'ATTIRE' is hidden in the letters of 'zermatt i repack'.
(Other definitions for attire that I've seen before include "'Dress, garb (6)'" , "Special clothing" , "Clothing, apparel" , "(To) dress; fine clothes" , "Garments" .)