Advertisement about soldier museum in a state (8)
I believe the answer is:
agitated
'in a state' is the definition.
(I've seen this before)
'advertisement about soldier museum' is the wordplay.
'advertisement' becomes 'ad' ('ad' can be a synonym of 'advertisement').
'about' is an insertion indicator.
'soldier' becomes 'gi' (government issue or general issue).
'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' enclosing 'gitate' is 'AGITATED'.
Can you help me to learn more?
(Other definitions for agitated that I've seen before include "Physically disturbed" , "Disturbed - excited" , "Unsettled" , "Troubled, perturbed" , "Worried" .)