Heroin addict abandoning us for £1 (7)

I believe the answer is:

smacker

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

'abandoning us for ps1' is the definition.
I can't judge whether this definition defines the answer.

'heroin addict' is the wordplay.
'heroin' becomes 'smack' (synonyms).
'addict' becomes 'er' (I can't justify this - if you can you should give a lot more credence to this answer).
'smack'+'er'='SMACKER'

Can you help me to learn more?

(Other definitions for smacker that I've seen before include "pound" , "Loud kiss -- PS1" , "someone taking part in strike?" , "Loud kiss - GBP1" .)

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.