More cunning shooter at Agincourt? (6)

I believe the answer is:

archer

I'm a little stuck... Click here to teach me more about this clue!

'more cunning shooter' is the definition.
'archer' can be an answer for 'shooter' (I've seen this before). I'm unsure of the 'more cunning' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for archer that I've seen before include "Jeffrey --, Eng. author" , "was more roguish" , "Tell perhaps" , "One uses bows and arrows" , "Irish parliament" .)

I've seen this clue in The Sun.

Want a hint initially instead of a full solution? Install my app