Pound put on black - splitting responsibility - it's normally red (6,3)

'normally red' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'pound put on black splitting responsibility' is the wordplay.
'pound' becomes 'L' (the pound sign is based on an L).
'put on' becomes 'don' (as in donning or putting on an item of clothing).
'black' becomes 'b' (as in pencil classifications).
'splitting' indicates putting letters inside (some letters split a word into two).
'responsibility' becomes 'onus' (onus is a duty or responsibility).
'don'+'b'='donb'
'donb' put into 'onus' is 'ondonbus'.
'l'+'ondonbus'='LONDON BUS'

'it's' is the link.

Can you help me to learn more?