European detective crossing stream in canvas shoe (10)
I believe the answer is:
espadrille
'canvas shoe' is the definition.
'european detective crossing stream in' is the wordplay.
'european' becomes 'E' (abbreviation e.g. EU).
'detective' becomes 'spade' (fictional detective Sam Spade).
'crossing stream' becomes 'rill' (rill is a kind of stream. I am not sure about the 'crossing' bit.).
'in' means one lot of letters goes inside another.
'spade' going around 'rill' is 'spadrille'.
'e'+'spadrille'='ESPADRILLE'
(Other definitions for espadrille that I've seen before include "goes on foot" , "Light rope-soled shoe" , "you put your foot in it" , "sandal!" , "Plaited fibres in its sole" .)