Picked a hundred socks (5)

I believe the answer is:

chose

'picked' is the definition.
(I've seen this before)

'a hundred socks' is the wordplay.
'a hundred' becomes 'c' (roman numeral).
'socks' becomes 'hose' (I've seen this before).
'c'+'hose'='CHOSE'

(Other definitions for chose that I've seen before include "Picked" , "Selected" , "Determined" , "article from Paris" , "preferred" .)

I've seen this clue in The Independent.

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