Little brother makes holes in material, causing fight (5)
I believe the answer is:
brawl
'fight' is the definition.
(I know that brawl is a type of fight)
'little brother makes holes in material' is the wordplay.
I cannot quite understand how this works, but
'little' could be 'l' (abbreviation for little) and 'l' is present in the answer.
'brother' could be 'br' (abbreviation in titles of monks) and 'br' is found within the answer.
The remaining letters 'aw' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'causing' is the link.
Can you help me to learn more?
(Other definitions for brawl that I've seen before include "Affray" , "I'd punt for a learned person" , "Unruly fight" , "Rowdy scuffle" , "Rowdy fight" .)