Old section with abstract style (2,3)
I believe the answer is:
op art
'abstract style' is the definition.
'op art' can be an answer for 'style' (I have seen 'Style of painting ' mean 'op art' so perhaps 'style' could also mean 'op art'). I'm unsure of the 'abstract' bit.
'old section' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'section' becomes 'part' (synonyms).
'o'+'part'='OP-ART'
'with' acts as a link.
Can you help me to learn more?
(Other definitions for op art that I've seen before include "Illusory design style" , "modern movement" , "modern painting" , "It may give the impression of movement" , "sort of painting" .)