Guardian 24,003

[cesdlv]

I'm obviously the only person stuck on these (last) two:
2d American money, very little of, is focused (7)
I have C?N?R?? and suspect it might be CENTRED, although I don't understand RED.

Which would help with
13a Old man deprived of all these years (5) for which I have G?A?? NB This is an undefined clue.

Will someone put me out of my misery, please.

[Quizmonster]

When someone has very little money, he might say, "I haven't got a red cent."
13a is Grand. These years = AD meaning 'anno domini', so remove from 'grandad'.

[cesdlv]

Wonderful, thanks, Quizmonster; I don't feel upset about failing to crack those two.

[kayakamina]

And of course is 'G' the theme of the puzzle.