Silver jubilee in all four quarters? (9)
I believe the answer is:
centenary
'silver jubilee' is the definition.
'centenary' can be an answer for 'jubilee' (thesaurus). I'm not sure about the 'silver' bit.
'all four quarters?' is the wordplay.
I cannot really see how this works, but
'quarters?' could be 'en' and 'en' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'in' acts as a link.
Can you help me to learn more?
(Other definitions for centenary that I've seen before include "One hundredth anniversary" , "celebration" , "special occasion" , "... so celebrating this next month" , "significant anniversary" .)