Within art movement, strange lack of taste (9)
I believe the answer is:
indecorum
'lack of taste' is the definition.
'indecorum' can be an answer for 'taste' (I have seen 'bad taste' mean 'indecorum' so perhaps 'taste' could also mean 'indecorum'). I'm not sure about the 'lack of' bit.
'within art movement strange' is the wordplay.
'within' becomes 'in'.
'art movement' becomes 'deco' (I can't justify this - if you can you should give a lot more credence to this answer).
'strange' becomes 'rum' (synonyms).
'in'+'deco'+'rum'='INDECORUM'
Can you help me to learn more?
(Other definitions for indecorum that I've seen before include "behaving badly" , "Lack of propriety" , "bad taste" , "Naughty behaviour" , "impropriety" .)