Order the ambitious officer hopes to get (7)
I believe the answer is:
command
'order' is the definition.
(commanding is a kind of ordering)
'the ambitious officer hopes to get' is the wordplay.
I cannot really see how this works, but
'officer' could be 'co' (Commanding Officer abbreviation) and 'co' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for command that I've seen before include "Bidding" , "Instruction, order" , "Authoritative instruction" , "Authoritative order" , "Understanding" .)