Complete an article for £50 (3)

I believe the answer is:

all

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'complete' is the definition.
(similar in meaning)

'an article for ps50' is the wordplay.
'an article' becomes 'a' (the indefinite article in English).
'for' is a charade indicator (letters next to each other).
'ps50' becomes 'll' (I can't justify this - if you can you should believe this answer much more).
'a'+'ll'='ALL'

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(Other definitions for all that I've seen before include "Fully clad ..." , "that's as many as there are" , "See 10 Across" , "nothing more" , "SECOND PART OF 8" .)

I've seen this clue in the Evening Standard.

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