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13 Across: Head imposed fine at University (6)
***n*e
16 Across: Keep opening an adjustable spanner(10) *******d*e
4 Across: They may be eaten in a custom on board (8) *a***g*s Cabbages or Sausages???

4. Sausages (it contains ss+ship +usage/custom+a)

S a usage S

13. Bounce (bonce/head+u/university)

Sorry, bounce might be wrong!

16 could be Drawbridge.

is 16 possibly DRAWBRIDGE?

"spanner" is sometimes used for "bridge"

You're probably finished by now but I had SCONCE for 13a