Figure to open a shop, still (5)

I believe the answer is:
seven
'figure' is the definition.
(seven is a number)
'open a shop still' is the wordplay.
'open a shop' becomes 's' (I can't explain this - if you can you should believe this answer much more).
'still' becomes 'even' (synonyms).
's'+'even'='SEVEN'
'to' is the link.
Can you help me to learn more?
(Other definitions for seven that I've seen before include "Number of sins, seas or dwarves" , "Cardinal" , "So many ages of man (AYLI)" , "Film" , "Little friends of ..." .)
