Blunt criticism from stalwart that goes to club (8)
I believe the answer is:
brickbat
'blunt criticism' is the definition.
(I've seen this before)
'stalwart that goes to club' is the wordplay.
'stalwart' becomes 'brick' (I've seen this in other clues).
'that goes to' says to put letters next to each other.
'club' becomes 'bat' (bat is a kind of club).
'brick'+'bat'='BRICKBAT'
'from' acts as a link.
(Other definitions for brickbat that I've seen before include "(Critic's) weapon" , "An uncomplimentary remark, or kind of missile" , "Building block used as missile" , "Hostile criticism - missile" , "Highly critical remark" .)