Champions from west side of capital cutting ace, surprisingly (7)
I believe the answer is:
chelsea
'champions from' is the definition.
I can't judge whether this definition defines the answer.
'west side of capital cutting ace surprisingly' is the wordplay.
'west' becomes 'hel' (I can't explain this - if you can you should believe this answer much more).
'of capital' says to take the initial letters (I've seen 'capital' mean this).
'cutting' means one lot of letters goes inside another (some letters cut their way into a word).
'surprisingly' indicates anagramming the letters.
The initial letter of 'side' is 's'.
'hel'+'s'='hels'
'ace' with letters rearranged gives 'cea'.
'hels' placed into 'cea' is 'CHELSEA'.
Can you help me to learn more?
(Other definitions for chelsea that I've seen before include "West London area" , "Cheyne Walk neighbourhood?" , "place of buns" , "Barracks here" , "Where you might get buns" .)