1a, 4words, 4.2.4.4. T??? ?? ??o? H?r?. Remove, perhaps, the PC element of present and past radio show.
9a, E???????c, Odd one out of entire hundred.
14d, ????o?i??, Large song books artist's lifted for a fitting person.
1a Take It From Here (old radio prog) - 'remove IT (PC) from here'
9a Eccentric - (clue reads "...three hundred") - anag 'entire + CCC (300)'
14d Sartorial - 'l(arge) air OT RAs' (all lifted)