Sign as sender, having wrapped the ring in it (7)
I believe the answer is:
endorse
'sign' is the definition.
(I know that endorse is a more specific form of the action sign)
'sender having wrapped the ring in it' is the wordplay.
I cannot really see how this works, but
'ring' could be 'o' (letter resembling a ring) and 'o' is found within the answer.
an anagram of 'sender' is 'endrse' which is located in the left over letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'as' is the link.
Can you help me to learn more?
(Other definitions for endorse that I've seen before include "Back, support" , "Give backing to" , "Approve - support" , "Champion" , "Countersign" .)