Shows a preference for putting street post office up (4)
I believe the answer is:
opts
'shows a preference' is the definition.
(I've seen this in another clue)
'putting street post office up' is the wordplay.
'post' can be anagrammed to 'OPTS'.
However, I'm not sure how this is indicated.
'for' is the link.
Can you help me to learn more?
(Other definitions for opts that I've seen before include "Elects" , "Makes choice from post" , "Selects between alternatives" , "Settles" , "Chooses from a range of possibilities" .)