Crossword Genius

Complain about a source of litter? (5)

Ross

I believe the answer is:

bitch

I'm a little stuck... Click here to teach me more about this clue!

'complain' is the definition.
(bitching is a kind of complaining)

'a source of litter?' is the wordplay.
I cannot really see how this works, but
'source' could be 'itch' (I have seen 'source of irritation' mean 'itch' so perhaps 'source' could also mean 'itch') and 'itch' is located in the answer.
A single letter 'b' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'about' is the link.

Can you help me to learn more?

(Other definitions for bitch that I've seen before include "Female animal" , "Retriever likely to drop" , "grouse" , "Malicious woman" , "Female dog" .)

I've seen this clue in the Evening Standard.
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