Someone to fight for the key to the office (3)
I believe the answer is:
foe
'someone' is the definition.
(foe is a kind of someone)
'fight for the key to the office' is the wordplay.
I cannot really understand how this works, but
'key' could be 'f' (I've seen this in other clues) and 'f' is found within the answer.
The remaining letters 'oe' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
'to' acts as a link.
Can you help me to learn more?
(Other definitions for foe that I've seen before include "Someone opposing" , "Am archaic enemy" , "Opposition" , "Adversary" , "friend never!" .)