Good man and woman's life wins heart of working campaigner against apartheid (5,4)

'campaigner against apartheid' is the definition.
(South African anti-apartheid campaigner)

'good man and woman's life wins' is the wordplay.
'good man' becomes 'st' (abbreviation for saint).
'and' means one lot of letters go next to another.
'woman' becomes 'Eve' (Eve is an example).
'life wins' becomes 'biko' (I can't explain this - if you can you should give a lot more credence to this answer).
'st'+'eve'+'biko'='STEVE BIKO'

'heart of working' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.