Seeing medicine container takes us back (6)
I believe the answer is:
visual
'seeing' is the definition.
(thesaurus)
'medicine container takes us back' is the wordplay.
'medicine container' becomes 'vial' (I've seen this in another clue).
'takes' means one lot of letters goes inside another.
'back' is a reversal indicator.
'us' written backwards gives 'su'.
'vial' going around 'su' is 'VISUAL'.
(Other definitions for visual that I've seen before include "Of or used in seeing" , "Pertaining to sight" , "Relating to, or using, sight" , "Of the eyes or sight" , "Relating to seeing" .)