Certain summer cottages (7)
I believe the answer is:
rentals
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">certain summer cottages</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for rentals that I've seen before include "Lets" , "Income from lettings" .)