Lethargy shown in Iran tie, unexpectedly (7)
I believe the answer is:
inertia
'lethargy' is the definition.
(both can mean a lack of movement)
'iran tie unexpectedly' is the wordplay.
'unexpectedly' is an anagram indicator.
'iran'+'tie'='irantie'
'irantie' with letters rearranged gives 'INERTIA'.
'shown in' is the link.
(Other definitions for inertia that I've seen before include "Motionlessness" , "showing reluctance to move" , "I tear in (anag.)" , "lack of action" , "Sloth; inactivity" .)