Boycott, holding firm -- this could be streaky (5)
I believe the answer is:
bacon
'be streaky' is the definition.
(I've seen this before)
'boycott holding firm' is the wordplay.
'boycott' becomes 'ban'.
'holding' means one lot of letters goes inside another.
'firm' becomes 'co' (a firm is a company).
'ban' going around 'co' is 'BACON'.
'this could' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for bacon that I've seen before include "Irish-born painter" , "Meat - essayist - painter" , "Author" , "The meat to bring home for success" , "Sizzling" .)