Soldier on LSD that works to achieve neutrality (7)
I believe the answer is:
antacid
'soldier on lsd that works to achieve neutrality' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'soldier on lsd' is the wordplay.
'soldier' becomes 'ant' (soldier is a type of ant).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'lsd' becomes 'acid' (synonyms).
'ant'+'acid'='ANTACID'
Can you help me to learn more?
(Other definitions for antacid that I've seen before include "Medicine counteracting gastric juices" , "Stomach-soothing medicine" , "Stomach-settling medicine" , "Indigestion relief" , "heartburn remedy" .)