Small space for leading Conservative in opportunity to improve (7)
I believe the answer is:
enhance
'improve' is the definition.
(I know that enhance is a more specific form of the action improve)
'small space for leading conservative in opportunity' is the wordplay.
'small space' becomes 'en' (in printing, a space as wide as a letter 'n').
'for' means one lot of letters go next to another.
'leading conservative in opportunity' becomes 'hance' (I can't justify this - if you can you should believe this answer much more).
'en'+'hance'='ENHANCE'
'to' is the link.
Can you help me to learn more?
(Other definitions for enhance that I've seen before include "Intensify, increase or improve" , "Add function, appeal, to" , "Heighten, intensify" , "produce better image" , "Improve, make more attractive" .)