Actually Dotty, I'm only that clue (19d) short of finishing.
But you could give me a hand explaining two that are not sitting with me right, can't seem to catch the word play in these.
1a) Service very deficient in the hairdressers? One must try to improve business. (11)
S - L - S - E - S - N.
I'm going with Salesperson but can only see SALON
7a) Man who is wise coming out with a Latin phrase (4,7)
H - M -, S - P - E - S
Man = Homo Sapiens which is Latin... but is that it?