End of year sale doesn't start row (7)
I believe the answer is:
ruction
'row' is the definition.
(thesaurus)
'end of year sale doesn't start' is the wordplay.
'end of' indicates one should take the final letters.
'sale' becomes 'auction' (I've seen this before).
'doesn't start' means to remove the first letter.
The last letter of 'year' is 'r'.
'auction' with its initial letter taken off is 'uction'.
'r'+'uction'='RUCTION'
(Other definitions for ruction that I've seen before include "Noisy disturbance" , "Disturbance, quarrel" , "Ruckus, rumpus" , "In court (anag.)" , "Uproar" .)