Single issue of new coins (5)
I believe the answer is:
scion
'single issue' is the definition.
'scion' can be an answer for 'issue' (I've seen this in another clue). I am not sure about the 'single' bit.
'new coins' is the wordplay.
'new' indicates an anagram.
'coins' with letters rearranged gives 'SCION'.
'of' is the link.
Can you help me to learn more?
(Other definitions for scion that I've seen before include "Young shoot or twig" , "Offshoot" , "one of a long line" , "Offspring" , "Young twig; descendant" .)