Deals with red stain after spillage (6,2)
I believe the answer is:
trades in
'deals with red stain after spillage' is the definition.
I can't tell whether this definition defines the answer.
'deals with red stain after' is the wordplay.
'deals with' is an anagram indicator (I've seen 'dealt with' mean this).
'after' says to put letters next to each other.
'red'+'stain'='redstain'
'redstain' with letters rearranged gives 'TRADES IN'.
Can you help me to learn more?
(Other definitions for trades in that I've seen before include "'Hands over the old object in part payment for the new (6,2)'" , "exchanges" , "Hands over an object as part payment for a new one" .)