Still the old-fashioned tin opener (3)
I believe the answer is:
yet
'still' is the definition.
(yet can mean still or so far)
'old-fashioned tin opener' is the wordplay.
'old fashioned' becomes 'ye' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'opener' indicates taking the first letters.
The first letter of 'tin' is 't'.
'ye'+'t'='YET'
'the' acts as a link.
Can you help me to learn more?
(Other definitions for yet that I've seen before include "To this time, nevertheless" , "Though; still" , "Up to the present time" , "Thus far" , "Still, even" .)