Just be all over the shop with tequila (9)

I believe the answer is:

equitable

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'just' is the definition.
(I know that just can be written as equitable)

I cannot understand how the rest of the clue works.

(Other definitions for equitable that I've seen before include "Even-handed" , "Fair, impartial" , "Fair to all parties" .)

I've seen this clue in The Times and The Sunday Times.

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