Wash the odd load and take below (7)
I believe the answer is:
launder
'wash' is the definition.
(I know that wash can be written as launder)
'odd load and take below' is the wordplay.
'odd' means one should take alternating letters.
'and take' means one lot of letters go next to another.
'below' becomes 'under' (synonyms).
The alternating letters of 'load' are 'la'.
'la'+'under'='LAUNDER'
'the' acts as a link.
(Other definitions for launder that I've seen before include "address the filth in lucre?" , "Perhaps decriminalise" , "clean habits" , "Trough" , "Wash or cleanse, clothes or money" .)