Loudly tease the guys before test starts - but only a little bit (8)
I believe the answer is:
fragment
'little bit' is the definition.
(thesaurus)
'loudly tease the guys before' is the wordplay.
'loudly' becomes 'f' (short for forte - 'loud' in music).
'tease' becomes 'rag' (synonyms).
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'guys' becomes 'men' (guy can mean a man).
'before' says to put letters next to each other.
't' put after 'men' is 'ment'.
'f'+'rag'+'ment'='FRAGMENT'
'test starts but only a' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for fragment that I've seen before include "Piece broken off something else" , "Scrap" , "Particle" , "Come to pieces" , "Incomplete part" .)