Perhaps needs to add going through it was depressing (8)

I believe the answer is:

saddened

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'going through it was depressing' is the definition.
I can't judge whether this definition defines the answer.

'perhaps needs to add' is the wordplay.
'perhaps' indicates an anagram.
'needs'+'add'='needsadd'
'needsadd' anagrammed gives 'SADDENED'.

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(Other definitions for saddened that I've seen before include "unhappiness" , "Made unhappy or melancholy" , "Distressed" , "Made sorrowful" .)

I've seen this clue in the Evening Standard.

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