Strongbox not closing after chap’s put in bundle (5)
I believe the answer is:
sheaf
'bundle' is the definition.
(I know that bundle can be written as sheaf)
'strongbox not closing after chap's put in' is the wordplay.
'strongbox' becomes 'safe' (safe is a kind of strongbox).
'not closing' means to remove the last letter.
'after chap' becomes 'he' (I am not sure about the 'after' bit.).
'put in' means one lot of letters goes inside another.
'safe' with its last letter removed is 'saf'.
'saf' going around 'he' is 'SHEAF'.
Can you help me to learn more?
(Other definitions for sheaf that I've seen before include "Bundle of several things tied together" , "Bundle as of arrows or corn stalks" , "Bundle, of grain stalks say" , "Bundle of wheat" , "Bundle, as of reeds for thatching" .)