Stand firm (6)
There are a few possibilities for this:
hold out
'stand firm' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for resist that I've seen before include "Sister (anag)" , "Withstand a force" , "Refuse to give in to" , "Offer opposition to" , "Defy for sister" .)
'stand firm' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for insist that I've seen before include "Take no refusal" , "Declare or demand emphatically" , "'Demand, make sure (6)'" , "Be firm in demands" , "Demand determinedly" .)
'stand firm' is the definition.
(synonyms)
This is all the clue.
(Other definitions for hold out that I've seen before include "Resist (against siege)" , "Endure, last" , "Continue to be sufficient" , "Offer inducement or maintain resistance" , "Offer as inducement or resist capture" .)