Sit around drinking sensible healthy drinks (7)
I believe the answer is:
tisanes
'healthy drinks' is the definition.
(tisane is a herbal tea)
'sit around drinking sensible' is the wordplay.
'around' says the letters should be written backwards.
'drinking' is an insertion indicator (inserted letters are consumed or drunk).
'sensible' becomes 'sane' (sane can mean sensible or reasonable).
'sit' in reverse letter order is 'tis'.
'tis' placed around 'sane' is 'TISANES'.
(Other definitions for tisanes that I've seen before include "More than one hot drink" , "herbal teas" , "infusions" , "Herb teas" , "Brews" .)