Help rinse out and fill (9)
I believe the answer is:
replenish
'fill' is the definition.
(I know that fill is a is a kind of of replenish)
'help rinse out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'help'+'rinse'='helprinse'
'helprinse' is an anagram of 'REPLENISH'.
'and' is the link.
(Other definitions for replenish that I've seen before include "Help siren (anag) - fill up again" , "Help siren (anag) - make up" , "Fill again, renew a supply" , "Restock, refill" , "Fill up again, say glass with drink" .)