Summary of Jack's pamphlet (8)
I believe the answer is:
abstract
'summary' is the definition.
(I know that abstract is a type of summary)
'jack's pamphlet' is the wordplay.
'jack's' becomes 'ab's' (both can mean a sailor).
'pamphlet' becomes 'tract' (synonyms).
'abs'+'tract'='ABSTRACT'
'of' is the link.
(Other definitions for abstract that I've seen before include "Academic" , "Remove - what isn't tangible" , "Intangible" , "Take away - immaterial" , "Conceptual" .)