Ft Cryptic 15,940

[AndyAS]

11D: Excuse for telegram, presumably? (7) ?R?T???
20A: Dad's following message about you, said in error (4,3) ?A?? ?A?
3D: Corrected heart valve using nothing for a change (6) E?O?V?

Thank you

[Lie-in King]

11d Pre-text
20a Faux pas - pa's (following) 'fax' (message, about) 'u' ("you")
3d Evolve - '(corr)e(cted)' (heart) + 'v(a)olve' ('o'; nothing, for 'a')

[aelmpvw]

11d pretext

[AndyAS]

Thank you Both!