A short delay in Switzerland leads to complaint (7)
I believe the answer is:
catarrh
'complaint' is the definition.
(medical complaint)
'a short delay in switzerland' is the wordplay.
'short' means to remove the last letter.
'delay' becomes 'tarry' (to tarry is to delay leaving a place).
'in' is an insertion indicator.
'switzerland' becomes 'ch' (short for Confoederatio Helvetica, its Latin name).
'tarry' with its final letter removed is 'tarr'.
'a'+'tarr'='atarr'
'atarr' placed into 'ch' is 'CATARRH'.
'leads to' is the link.
(Other definitions for catarrh that I've seen before include "Nasal discharge of mucus" , "Head cold" , "Inflammation of membrane of nose and throat" , "Nasal build-up" , "Inflammation often blocking the nose" .)