Soak in order to extract flavouring from (6)
I believe the answer is:
infuse
(Other definitions for infuse that I've seen before include "Steep tea in boiling water" , "Soak in liquid to extract the flavour, tea say" , "Instil or steep in liquid, as to make tea" , "Imbue or instil" , "Soak (tea etc) in liquid to extract flavour" .)