Traitors at the top sacrificed Britain in war to give away secrets (6)
I believe the answer is:
tattle
'give away secrets' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'traitors at the top sacrificed britain in war' is the wordplay.
I cannot quite see how this works, but
'at' is found in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
This may be the basis of clue (or it may be nonsense).
'to' acts as a link.
Can you help me to learn more?
(Other definitions for tattle that I've seen before include "Tell tales" , "Divulge secrets" , "Gossip, idle chatter" , "'Gossip, idle talk (6)'" , "Chatter idly" .)