Dishonest activity cloak and dagger in the end (5)
I believe the answer is:
caper
'dishonest activity' is the definition.
(caper can mean a dishonest scheme)
'cloak and dagger in the end' is the wordplay.
'cloak' becomes 'cape' (cape is a kind of cloak).
'and' is a charade indicator (letters next to each other).
'in the end' says to take the final letters.
The last letter of 'dagger' is 'r'.
'cape'+'r'='CAPER'
(Other definitions for caper that I've seen before include "illegal scheme" , "Pickled bud - escapade" , "Ridiculous escapade" , "jump around?" , "game" .)