Biographer's left to swap places with female for anti-abortionist (3-5)

'biographer's left to swap places' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'with female for anti-abortionist' is the wordplay.
'with' is an insertion indicator.
'female' becomes 'f' (common abbreviation).
'for' becomes 'pro' (as in being 'pro' or in favour of something).
'anti abortionist' becomes 'lier' (I can't explain this - if you can you should give a lot more credence to this answer).
'pro'+'lier'='prolier'
'f' put into 'prolier' is 'PRO-LIFER'.

Can you help me to learn more?