Blast sock repair (4)
I believe the answer is:
darn
This could be a double definition.
'blast' is the first definition.
(thesaurus)
'sock repair' is the second definition.
'darn' can be an answer for 'repair' (I've seen this before). I'm not certain of the 'sock' bit.
Can you help me to learn more?
(Other definitions for darn that I've seen before include "Mild oath; repair (socks)" , "curse" , "Repair (sock)" , "Mend a hole in a sock" , "Repair with wool" .)