10a Start of first introduction in garden (still unchanged on reflection) (5)
??d?m
Madam? Can't see what the definition might be.
23a Info, including something to do with key and pitch of instrument (12)
Looks like 'glockenspiel'. I can see the info outside lock, but not how spiel equates to pitch.
5d German writer with a short act kept in shade: influence on our acting (5,6).
First word looks like 'human'
Human nature?