Animated Conservative infiltrating left (7)
I believe the answer is:
excited
'animated conservative infiltrating left' is the definition.
I can't judge whether this definition defines the answer.
'animated conservative infiltrating left' is the wordplay.
'animated conservative' becomes 'c' (abbreviation commonly used in UK politics. I am not sure about the 'animated' bit.**).
'infiltrating' indicates putting letters inside.
'left' becomes 'exited' ('exit' can be a synonym of 'leave').
'c' going inside 'exited' is 'EXCITED'.
Can you help me to learn more?
(Other definitions for excited that I've seen before include "Aroused; eager" , "Aroused, enthused" , "Thrilled; agitated" , "In a stir" , "Very eager and enthusiastic" .)