Where holiday-makers may be affected by builder's plot? (8)
I believe the answer is:
campsite
'where holiday-makers may be affected' is the definition.
The definition suggests a singular noun which matches the answer.
'builder's plot?' is the wordplay.
'builder's' becomes 'camp' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'plot?' becomes 'site' (as in a plot of land).
'camp'+'site'='CAMPSITE'
'by' is the link.
Can you help me to learn more?
(Other definitions for campsite that I've seen before include "Location for pitching tents" , "Ground for tents" , "for temporary accommodation" .)