Crossword Genius

Store performing without PG Tips (3,2)

Ross

I believe the answer is:

lay in

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'store' is the definition.
('lay in' can be a synonym of 'store')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for lay in that I've seen before include "Acquire (a supply of)" , "Store" .)

I've seen this clue in The Telegraph.
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