Launders 50 euro in tins (6)
I believe the answer is:
cleans
'launders' is the definition.
(I've seen this in another clue)
'50 euro in tins' is the wordplay.
'50' becomes 'l' (Roman numeral).
'euro' becomes 'E' (E resembles the Euro symbol).
'in' is an insertion indicator.
'tins' becomes 'cans' ('can' can be a synonym of 'tin').
'l'+'e'='le'
'le' going within 'cans' is 'CLEANS'.
(Other definitions for cleans that I've seen before include "Valets" , "Tidies up" , "See 14" , "Frees from dirt" , "Washes, removes dirt" .)