Concerned with seeing us reflected in glass bottle (6)
I believe the answer is:
visual
'concerned' is the definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I don't see?
'seeing us reflected in glass bottle' is the wordplay.
'seeing us' becomes 'us' (synonyms).
'reflected' says the letters should be written backwards (letters reflected back).
'in' indicates putting letters inside.
'glass bottle' becomes 'vial' (I've seen this in another clue).
'us' written backwards gives 'su'.
'su' placed within 'vial' is 'VISUAL'.
'with' acts as a link.
Can you help me to learn more?
(Other definitions for visual that I've seen before include "Relating to, or using, sight" , "Pertaining to sight" , "Of sight and seeing" , "Relating to seeing" , "Of or used in seeing" .)