Sunday Times

[bravodeltic]

Help on a couple please
6d ex serviceman, ambassador and lawyer in state avert disaster (4,3,3) ??v? T?e ???
6a drink from well linked with case of diphtheria (4) ????
13d they'd promote nice mobile in pithy words (2,8)
?? ???n?I??

Thanks in advance

[Lie-in King]

6d Save the day - 'vet(eran) + H(is/er) E(xcellency) + DA' (all in) 'say' (state)
6a Soda - 'so' (well) + 'd(iphtheri)a' (case of)
13d Ad agencies - anag 'nice' (in) 'adages'