State who in Paris inside is trembling (7)
I believe the answer is:
aquiver
'is trembling' is the definition.
(I've seen this before)
'state who in paris inside' is the wordplay.
'state' becomes 'aver' (I've seen this before).
'who in paris' becomes 'qui' (French for 'who').
'inside' indicates putting letters inside.
'aver' enclosing 'qui' is 'AQUIVER'.
(Other definitions for aquiver that I've seen before include "shaking" , "Trembling" , "Flickering" , "far from steady" , "shuddering" .)