Sort of knife that is found after surrender (5)
I believe the answer is:
bowie
'sort of knife' is the definition.
'that is found after surrender' is the wordplay.
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'found after' means one lot of letters go next to another.
'surrender' becomes 'bow' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ie' after 'bow' is 'BOWIE'.
Can you help me to learn more?
(Other definitions for bowie that I've seen before include "Rock-based chameleon" , "Art rocker David" , "Dagger-knife" , "American frontiersman, killed at the Alamo, 1836" , "David --, singer" .)