According to where you want to go, you can use Kew Bridge, Brentford or even Syon Park...they are all on the same line. Have a look on Google Earth.
Theoretically, I suppose you could change at Clapham Junction, but i) not all trains stop there and ii) its a right pain to change platforms there 'cos you have to go up and down stairs. As the whole trip is about an hour, I'd go into Victoria.
Simon