Clue:

 

I hear you cut that girl; sweet derision.

(7 letters)

I keep thinking of cutlass but it isn’t that…

_ _ i _ _ _ _

Yes twyngwyn.

 

All yours.

 

 

quickie:

 

addendum; I hear the fish is unwell (7)

Codicil 

back to you

Clue:

 

I hear the prison is hurtful inside. A corrective service, maybe!

(10 letters)

_ e _ _ _ i _ _ _ _