In close proximity (5,2,4)
I think it could be either:
cheek by jowl
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">in close proximity</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for cheek by jowl that I've seen before include "In immediate proximity" , "closely linked" , "Side by side, close" , "Close together" , "In close proximity" .)
(Other definitions for side by side that I've seen before include "Next to each other" , "Close together, abreast" , "In tandem" , "Level" , "As partners" .)