Place in Germany — you and I arrive on St David's Day (6)

I believe the answer is:

weimar

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'place in germany you and i' is the definition.
I can't tell whether this definition defines the answer.

'arrive on st david's day' is the wordplay.
'arrive on' becomes 'we' (I can't explain this - if you can you should believe this answer much more).
'st david's day' becomes 'I Mar' (I Mar resembles w March, St David's Day).
'we'+'imar'='WEIMAR'

Can you help me to learn more?

(Other definitions for weimar that I've seen before include "German city; -- Republic" , "City of Germany" , "German republic until 1933" , "13 [THIRD REICH] 's predecessor" , "German town associated with Goethe, Liszt and Schiller" .)

I've seen this clue in The Times.

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