Where lawyers find glasses appropriate? (8)

I believe the answer is:

atthebar

I'm a little stuck... Click here to teach me more about this clue!

'glasses appropriate?' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'where lawyers' is the wordplay.
'where' becomes 'at' (I can't justify this - if you can you should believe this answer much more).
'lawyers' becomes 'the bar' (I've seen this in another clue).
'at'+'thebar'='ATTHEBAR'

'find' is the link.

Can you help me to learn more?

I've seen this clue in The Irish Independent.

Want a hint initially instead of a full solution? Install my app