Breathe in (6)
I believe the answer is:
inhale
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">breathe in</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for inhale that I've seen before include "Draw air into lungs" , "Take smoke into the lungs" , "Draw in air or smoke" , "take the air" , "drag" .)