Gangways (6)
I believe the answer is:
aisles
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">gangways</span>' is the definition.<br/ ><span class="explanation-format__explanation">('aisle' can be a synonym of 'gangway')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for aisles that I've seen before include "Gangways" , "Passageways between seats" , "Spaces between seats" , "Lassie (anag.)" , "Lassie in church pathways" .)