Accountant taken in by traveller's summary (5)
I believe the answer is:
recap
'summary' is the definition.
(I know that recap is a type of capitulation)
'accountant taken in by traveller's' is the wordplay.
'accountant' becomes 'CA' (abbreviation for chartered accountant).
'taken in by' means one lot of letters goes inside another (back).
'traveller' becomes 'rep' (travel company worker).
'ca' going inside 'rep' is 'RECAP'.
(Other definitions for recap that I've seen before include "Go over the main points again, in short" , "Retrospective summary" , "Go over again with backward pacer" , "Quickly run through" , "Go over things again" .)