Time to run fast or dash (5)
I believe the answer is:
trace
'dash' is the definition.
(thesaurus)
'time to run fast' is the wordplay.
'time' becomes 't'.
'to' says to put letters next to each other.
'run fast' becomes 'race' (I've seen this before**).
't'+'race'='TRACE'
'or' acts as a link.
(Other definitions for trace that I've seen before include "Outline" , "Evidence" , "Locate by investigation" , "Element" , "Tinge; copy" .)