Crossword Genius

An agent brought up; building collapsed (8)

Ross

I believe the answer is:

perished

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'collapsed' is the definition.
The answer and definition can be both related to change as well as being past participle verbs.
Perhaps there's an association between them I don't understand?

'an agent brought up building' is the wordplay.
'an' becomes 'i' (Roman numeral for one).
'agent' becomes 'rep' (short for representative).
'brought up' is a reversal indicator (down clues only).
'building' becomes 'shed' (shed is a kind of building).
'i'+'rep'='irep'
'irep' reversed gives 'peri'.
'peri'+'shed'='PERISHED'

Can you help me to learn more?

(Other definitions for perished that I've seen before include "Ruined" , "Decayed, died" , "(Of rubber) forty three" , "Died, failed" , "Extremely cold - died - rotted" .)

I've seen this clue in The Hindu.
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