Withdraw a summary (8)
I believe the answer is:
abstract
I believe this is a double definition.
'withdraw' is the first definition.
(thesaurus)
'a summary' is the second definition.
(abstract is a kind of summary)
(Other definitions for abstract that I've seen before include "concept" , "Take away - immaterial" , "hard to understand" , "Brats act in non-concrete way" , "Remove - what isn't tangible" .)