Fixed hurriedly (4)
I believe the answer is:
fast
This clue is a double definition.
'fixed' is the first definition.
(synonyms)
'hurriedly' is the second definition.
(thesaurus)
(Other definitions for fast that I've seen before include "not lento" , "Avoid food; rapid" , "Go without food" , "Exercise for spiritual wellbeing" , "'Quickly, rapidly (4)'" .)