You Crossword No 1,322

[Ramesses]

Hi Everyone,just stuck on a few,any help much appreciated
10Across: How Municipal Chief Executives used to be known _O_N _L_R_S ? (4/6)
20Across: (2 Down and 3 Down) treated (21 Down) with this in Rising Damp D_R_S_O_?
13Down: Sending something again by sea R_S_I_P_O_?

[yogasun]

Town Clerks
Derision?
Reshipping

[wardlaw]

Town clerks

[Ramesses]

Many thanks

[brendanorris]

13 d reshipping

[brendanorris]

14a theory

[boxtops]

next time rameses, it would help if you'd told us the answers referred to in 20a - the clue doesn't make sense, otherwise.

[brendanorris]

25 a meaning

[brendanorris]

20 a derision

[bellawina]

Prize crossword no. 1581 stuck on this last one army officer acting as an assistant to a more senior officer (8 letters) ? D ? U ? A ? T thanks for any help given

[vakayu]

town clerks

[sandyRoe]

Adjutant

[vakayu]

adjutant