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17a . 3letters. -s- greek character penny is coming back. 18d. 3 letters .-s-. one ergeant- major had distinctive theory. 20a. 3 letters. -o- .bell the cat.

17a P si
18d Ism
20a Tom

17a . 3letters. -s- greek character penny is coming back.
PSI

18d. 3 letters .-s-. one ergeant- major had distinctive theory.

ISM

20a. 3 letters. -o- .bell the cat.

TOM (I guess)

greatful to you both thanks.