Said clearly the aim is to curb the weight (8)
I believe the answer is:
enounced
'said clearly' is the definition.
'enounced' can be an answer for 'said' ('enounce' can be a synonym of 'say'). I am not sure about the 'clearly' bit.
'aim is to curb the weight' is the wordplay.
'aim' becomes 'end' (both can mean a goal or purpose).
'is to curb' is an insertion indicator (curb can mean to restrain or contain).
'the weight' becomes 'ounce' (unit of weight).
'end' enclosing 'ounce' is 'ENOUNCED'.
'the' acts as a link.
Can you help me to learn more?
(Another definition for enounced that I've seen is " spoke with great precision".)