Caddie initially glued broken club (6)
I believe the answer is:
cudgel
'club' is the definition.
(I've seen this before)
'caddie initially glued broken' is the wordplay.
'initially' indicates taking the first letters.
'broken' indicates anagramming the letters.
The initial letter of 'caddie' is 'c'.
'glued' with letters rearranged gives 'udgel'.
'c'+'udgel'='CUDGEL'
(Other definitions for cudgel that I've seen before include "Short stout stick" , "Wooden weapon" , "Stout stick used as a weapon" , "brain" , "A ruffian's club" .)