Compulsion to set alight extremely pretty country (9)
I believe the answer is:
pyromania
'compulsion to set alight' is the definition.
I can't judge whether this definition defines the answer.
'extremely pretty country' is the wordplay.
'extremely' means to remove the middle letters (only the extremes of the word are used).
'country' becomes 'romania' (European country).
'pretty' with its middle removed is 'py'.
'py'+'romania'='PYROMANIA'
Can you help me to learn more?
(Other definitions for pyromania that I've seen before include "Fire-raising compulsion" , "Flaming madness!" , "igniting lots of fires" , "Fire-raising impulse" , "setting of conflagration" .)