Petitions involving two Conservatives beginning to see positive result (7)
I believe the answer is:
success
'positive result' is the definition.
(I've seen this before)
'petitions involving two conservatives beginning to see' is the wordplay.
'petitions' becomes 'sues' (I've seen this in another clue).
'involving' means one lot of letters goes inside another.
'two' says to double the letters.
'conservatives' becomes 'C' (abbreviation in UK politics).
'beginning to' indicates taking the first letters.
The first letter of 'see' is 's'.
'c' duplicated is 'cc'.
'sues' placed around 'cc' is 'succes'.
'succes'+'s'='SUCCESS'
(Other definitions for success that I've seen before include "Achieved aim" , "Favourable outcome of attempt" , "A win" , "Victory - prosperity" , "Prosperous achievement" .)