Flared trousers (4-7)
I believe the answer is:
bell-bottoms
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">flared trousers</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for bell-bottoms that I've seen before include "Wide-flared trousers" , "Trousers with a flare below the knee" , "Flared trousers" , "Sailor's trousers" , "Naval rating's trousers" .)