Junior officer Bill’s project secures bronze (8)
I believe the answer is:
adjutant
'junior officer' is the definition.
'adjutant' can be an answer for 'officer' (adjutant is a kind of officer). I'm unsure of the 'junior' bit.
'bill's project secures bronze' is the wordplay.
'bill' becomes 'ad' (advertisement stuck on wall).
'project' becomes 'jut' (I've seen this before).
'secures' means one lot of letters goes inside another.
'bronze' becomes 'tan' (synonyms).
'jut' enclosing 'tan' is 'jutant'.
'ad'+'jutant'='ADJUTANT'
Can you help me to learn more?
(Other definitions for adjutant that I've seen before include "Aide-de-camp" , "Officer who helps" , "Army staff officer" , "one with large bill" , "Military admin officer" .)