Diner from steelyard drops LSD (6)
I believe the answer is:
eatery
'diner' is the definition.
(thesaurus)
'from steelyard drops lsd' is the wordplay.
'from' indicates an anagram (from the letters).
'drops' indicates named letters should be taken away.
'steelyard' with 'lsd' taken out is 'teeyar'.
'teeyar' is an anagram of 'EATERY'.
(Other definitions for eatery that I've seen before include "diner" , "Brasserie" , "Restaurant, cafe" , "[BISTRO]" , "Place serving food" .)