Is getting in support to carry on the fight (6)
I believe the answer is:
resist
'carry on the fight' is the definition.
'resist' can be an answer for 'fight' (I've seen this before). I am unsure of the 'carry on the' bit.
'is getting in support' is the wordplay.
'getting in' indicates putting letters inside.
'support' becomes 'rest' (e.g. a shoulder rest is a support for shoulder).
'is' placed inside 'rest' is 'RESIST'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for resist that I've seen before include "Hold out for sister" , "Don't give in" , "Withstand or defy" , "Stand up to, fight against" , "Put up fight, oppose forcefully" .)