Second coin flipped contents heir (5)
I believe the answer is:
scion
'heir' is the definition.
(I've seen this in another clue)
'second coin flipped contents' is the wordplay.
I cannot really understand how this works, but
'second' could be 's' (common abbreviation) and 's' is found within the answer.
an anagram of 'coin' is 'cion' which is within the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for scion that I've seen before include "one of a long line" , "Issue" , "Younger member of a family" , "Young child" , "Plant shoot; descendant of a noble family;" .)