Lower quarters for yachting week (5)
I believe the answer is:
cowes
'for yachting week' is the definition.
I can't judge whether this defines the answer.
'lower quarters' is the wordplay.
'lower' becomes 'cow' (something which lows - makes cow sounds).
'quarters' becomes 'es'.
'cow'+'es'='COWES'
Can you help me to learn more?
(Other definitions for cowes that I've seen before include "English town?" , "where regatta happens" , "IOW regatta venue" , "Isle of Wight regatta town" , "IOW regatta town" .)