Fast start from a quiet side of Yorkshire (3,9)
I believe the answer is:
ash wednesday
'fast start' is the definition.
(beginning of Lent)
'a quiet side of yorkshire' is the wordplay.
I cannot really understand how this works, but
'a' is present in the answer.
'quiet' could be 'sh' ('sh' is used to tell someone to be quiet) and 'sh' is found in the answer.
The remaining letters 'wednesday' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'from' is the link.
Can you help me to learn more?
(Other definitions for ash wednesday that I've seen before include "Start of Lent" , "Time to start doing without" , "Poem by T.S. Eliot" , "fast start" , "First day of Lent" .)