Steady directions to appointment (6)
I believe the answer is:
sedate
'steady' is the definition.
(thesaurus)
'directions to appointment' is the wordplay.
'directions' becomes 'se' (I've seen this in other clues).
'to appointment' becomes 'date' (synonyms).
'se'+'date'='SEDATE'
(Other definitions for sedate that I've seen before include "Staid - tranquillise" , "Slow" , "Teased into being calm" , "Give calming drug to" , "Calm; put to sleep" .)