Time and motive for crime (7)
I believe the answer is:
treason
'crime' is the definition.
(treason is a kind of crime)
'time and motive' is the wordplay.
'time' becomes 't'.
'and' means one lot of letters go next to another.
'motive' becomes 'reason' (reason is a kind of motive).
't'+'reason'='TREASON'
'for' acts as a link.
(Other definitions for treason that I've seen before include "Senator (anag)" , "Stare on (anag.)" , "One rats (anag)" , "Offence against state" , "Crime of disloyalty" .)