Engine needed to dock and secure the last boat (5)
I believe the answer is:
motor
'engine' is the definition.
(I've seen this before)
'to dock and secure the last boat' is the wordplay.
I cannot really see how this works, but
'to' is present in the answer.
The remaining letters 'mor' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'needed' acts as a link.
Can you help me to learn more?
(Other definitions for motor that I've seen before include "go quickly" , "Move quickly" , "Wheels" , "Machine that converts energy into motion" , "Car; travel quickly" .)