Regularly goes into battle, you bet (5)
I believe the answer is:
wager
'you bet' is the definition.
'wager' can be an answer for 'bet' (synonyms). I am unsure of the 'you' bit.
'regularly goes into battle' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'into' indicates putting letters inside.
'battle' becomes 'war' (I've seen this before).
The alternating letters of 'goes' are 'ge'.
'ge' placed into 'war' is 'WAGER'.
Can you help me to learn more?
(Other definitions for wager that I've seen before include "stake required" , "(Place a) stake" , "A bet or stake" , "Put on a bit" , "Bet, gamble" .)