Disturbed by advertisement about Soldier Museum (8)
I believe the answer is:
agitated
'disturbed' is the definition.
(agitating is a kind of disturbing)
'advertisement about soldier museum' is the wordplay.
'advertisement' becomes 'ad' (short for advert).
'about' is an insertion indicator.
'soldier' becomes 'GI' (GI can mean a US soldier).
'museum' becomes 'tate' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'gi'+'tate'='gitate'
'ad' placed around 'gitate' is 'AGITATED'.
'by' is the link.
Can you help me to learn more?
(Other definitions for agitated that I've seen before include "Aroused - disturbed" , "Worked up, flustered" , "caused a stir" , "Jittery, hyped up" , "Distressed" .)