Agents I'd tried went to pieces (13)

I believe the answer is:

disintegrated

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'agents i'd tried went to pieces' is the definition.
I can't tell whether this defines the answer.

'agents i'd tried went' is the wordplay.
'went' is an anagram indicator ('go' can mean move).
'agents'+'id'+'tried'='agentsidtried'
'agentsidtried' is an anagram of 'DISINTEGRATED'.

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(Other definitions for disintegrated that I've seen before include "Broke up" , "Fell to pieces" , "Fell apart" , "Went to bits" , "Fallen apart" .)

I've seen this clue in The Irish Independent.

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