Remove Address From Key?

[Dave Barton]

I have recently dropped one of my email addresses (eg.bmcs at defunct.com)
and I want to remove this address from my key:

~> gpg --list-keys bmcs at myrealbox.com
pub  1024D/9ABF6F14 2002-11-11 Dave Barton <bmcs at defunct.com>
uid                            Dave Barton <bmcs at myrealbox.com>
sub  1024g/0B78C259 2002-11-11

Is there a way of removing this address, without deleting my entire key.

TIA

Dave