Retaining one’s balance, don’t give in to (6)
I believe the answer is:
resist
'don't give in to' is the definition.
I can't judge whether this definition defines the answer.
'retaining one's balance' is the wordplay.
'retaining' indicates putting letters inside.
'one's' becomes 'is' (roman numeral).
'balance' becomes 'rest' (I've seen this before).
'is' going into 'rest' is 'RESIST'.
Can you help me to learn more?
(Other definitions for resist that I've seen before include "Forgo" , "Withstand a force" , "Sister (anag)" , "Check; withstand" , "Withstand or defy" .)