Swell out (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">swell out</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for billow that I've seen before include "Surge" , "Swell out, as a flag" , "Swell out (as a sail)" , "Wave; upward flow" , "Become inflated; rise up, as in waves" .)
(Other definitions for bloat that I've seen before include "Make swollen" , "Thus treat some fish" , "Swell with fluid or gas" , "Fill up with gas" , "Cause to swell" .)