Deep irritation leads to depression? (5)

I believe the answer is:

ditch

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'depression?' is the definition.
(I have seen 'long depression' mean 'ditch' so perhaps 'depression' could also mean 'ditch')

'deep irritation' is the wordplay.
'deep' becomes 'd' (this might be a standard abbreviation which I don't know about).
'irritation' becomes 'itch' (an itch irritates you).
'd'+'itch'='DITCH'

'leads to' acts as a link.

Can you help me to learn more?

(Other definitions for ditch that I've seen before include "Abandon - trench" , "long depression" , "Jettison" , "Get rid of; dug channel" , "Gully or furrow" .)

I've seen this clue in the Evening Standard.

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