Treating snot with strange remedy (7)
I believe the answer is:
nostrum
'remedy' is the definition.
(I know that nostrum is a type of remedy)
'treating snot with strange' is the wordplay.
'treating' indicates an anagram.
'with' means one lot of letters go next to another.
'strange' becomes 'rum' (similar in meaning).
'snot' is an anagram of 'nost'.
'nost'+'rum'='NOSTRUM'
(Other definitions for nostrum that I've seen before include "Patent medicine with questionable efficacy" , "our Latin" , "Panacea or cure-all" , "answer to all problems!" , "Ineffective medicine" .)