Ohio politician enthralled by my sex appeal (5)
I believe the answer is:
oomph
'sex appeal' is the definition.
(I know that sex appeal can be written as oomph)
'ohio politician enthralled by my' is the wordplay.
'ohio' becomes 'O' (abbreviation for Ohio).
'politician' becomes 'MP' (Member of Parliament).
'enthralled by' indicates putting letters inside ('enthral' can mean 'capture').
'my' becomes 'oh' (both are expressions of surprise).
'mp' placed into 'oh' is 'omph'.
'o'+'omph'='OOMPH'
(Other definitions for oomph that I've seen before include "Spirited vigour" , "drive" , "Ginger" , "attractiveness" , "Informal energy or enthusiasm, usually in a girl" .)