Route for deliveries of sort run in barrow? (4,5)
I believe the answer is:
milk round
'route for deliveries' is the definition.
(route for delivering milk)
'sort run in barrow?' is the wordplay.
'sort' becomes 'ilk' (ilk is a kind of sort).
'run' becomes 'r' (cricket abbreviation).
'in' is an insertion indicator.
'barrow?' becomes 'mound' (barrow is a kind of mound).
'ilk'+'r'='ilkr'
'ilkr' put within 'mound' is 'MILK ROUND'.
'of' is the link.
(Other definitions for milk round that I've seen before include "recruitment drive" , "delivery job" , "Early morning delivery" , "Everyone will be up for" .)