Gather, pile up (5)

I believe the answer is:

amass

This clue is a double definition.

'gather' is the first definition.
(amass can mean to collect or gather)

'pile up' is the second definition.
(synonyms)

(Other definitions for amass that I've seen before include "run up?" , "Assemble" , "Collect or gather" , "Gather in great quantity" , "Accumulate, pile up" .)

I've seen this clue in The Irish Times.

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