Blunt criticism where decent chap joins club (8)
I believe the answer is:
brickbat
'blunt criticism' is the definition.
(I've seen this in another clue)
'decent chap joins club' is the wordplay.
'decent chap' becomes 'brick' (I've seen this in other clues).
'joins' is a charade indicator (letters next to each other).
'club' becomes 'bat' (as in sporting equipment).
'brick'+'bat'='BRICKBAT'
'where' acts as a link.
(Other definitions for brickbat that I've seen before include "Hostile criticism - missile" , "An uncomplimentary remark, or kind of missile" , "(Critic's) weapon" , "Strong criticism" , "Highly critical remark" .)