Store in Panama's shut (5)

I believe the answer is:

amass

'store' is the definition.
(amassing is a kind of storing)

'in panama's shut' is the wordplay.
'in' indicates the answer is hidden within the clue.
'AMASS' is hidden within 'panamas shut'.

(Other definitions for amass that I've seen before include "store" , "Gather together, pile up" , "Accrue, heap up" , "Accumulate over time" , "Get together" .)

I've seen this clue in The Sun.

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