Trace calls in it on the move (9)
I believe the answer is:
scintilla
'trace' is the definition.
(thesaurus)
'calls in it on the move' is the wordplay.
'on the move' is an anagram indicator.
'calls'+'in'+'it'='callsinit'
'callsinit' with letters rearranged gives 'SCINTILLA'.
(Other definitions for scintilla that I've seen before include "A spark; a trace" , "Tiny hint, trace" , "flash" , "little bit" , "Tiny trace or amount" .)