My Last 4!

[fishlover]

Please can you help me on my last 4 clues?
2down As if Chicken and Tice perhaps should be put on in a lazy way(I can only think of Timothy but cannot make sence of it! 16 across River creature found by water rat. R?t?u? 19 down Legion assembled around British base.I???b?e and lastly 23 across. Trndy arrested by FBI agent and given punishment. Forgive me but I have not been doing this crossword for long and really want to learn!
Thank you very much in advance.

[ubasses]

timidly
rotter
ignoble
fined

[Mamyalynne]

2down As if Chicken and Tice perhaps should be put on in a lazy way(I can only think of Timothy but cannot make sence of it!

16 across River creature found by water rat. R?t?u?

19 down Legion assembled around British base.I???b?e

23 across. Trndy arrested by FBI agent and given punishment.

[ubasses]

should read rice Tim (Rice) Idly (lazy)

[sedge47]

2d TIM (Rice) + IDLY (in a lazy way)
16a R(iver) + OTTER
19d Ignoble (anagram of legion containing B)
23a fined - IN (trendy) inside (arrested by) Fed (FBI agent)