Hi Loubyloo,
16a I think “having yen” makes it clear that the yen part is in the answer, but I agree 5d helps to confirm
2d ‘tactical unit’ is the Chambers definition of the homophone of the answer
3d is a cryptic definition (think biblical)
13d copper is the first letter, then it’s 2 letters inside a 7 letter word for directions
Hope that helps.