Painting by Pollock perhaps intangible (8)
I believe the answer is:
abstract
This clue is a double definition.
'painting by pollock perhaps' is the first definition.
(Jackson Pollock was an abstract painter)
'intangible' is the second definition.
(associated in meaning)
(Other definitions for abstract that I've seen before include "Sketchy summary of the main points" , "Extract; summary" , "Nick" , "Summary (of an article)" , "concept" .)