Small earthquake in Turkey upset capital city (6)
I believe the answer is:
tremor
'small earthquake' is the definition.
(I've seen this before)
'turkey upset capital city' is the wordplay.
'turkey' becomes 'tr' (I've seen this in other clues).
'upset' says the letters should be written in reverse.
'capital city' becomes 'rome' (I've seen this before).
'rome' in reverse letter order is 'emor'.
'tr'+'emor'='TREMOR'
'in' acts as a link.
(Other definitions for tremor that I've seen before include "A little agitation" , "make one shake" , "feeling of excitement" , "Slight earthquake" , "Shudder - quake" .)