Discreet informal name for a drug product (7)
I believe the answer is:
guarded
'discreet' is the definition.
(thesaurus)
'informal name for a drug product' is the wordplay.
I cannot quite understand how this works, but
'name' could be 'de' and 'de' is found in the answer.
'a' is within the answer.
an anagram of 'drug' is 'gurd' which is located in the left over letters.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for guarded that I've seen before include "Cautious - or protected" , "offered protection" , "Protected from a drudge" , "Kept watch over" , "Cautious, having reservations" .)