No 1, Douglas Street? (5)

I believe the answer is:

first

'no 1' is the definition.

'douglas street?' is the wordplay.
'douglas' becomes 'fir' (douglas fir is an example).
'street?' becomes 'st'.
'fir'+'st'='FIRST'

(Other definitions for first that I've seen before include ""Eclipse _____ ..." , "Original" , "Foremost" , "Pre-eminent" , "best" .)

I've seen this clue in The Guardian.

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