Child pens first letter on back of Easter card (5)
I believe the answer is:
tarot
'card' is the definition.
(I've seen this before)
'child pens first letter on back of easter' is the wordplay.
'child' becomes 'tot' (I've seen this before).
'pens' means one lot of letters goes inside another.
'first' means one lot of letters go next to another.
'letter on' becomes 'a' (I am not sure about the 'on' bit.**).
'back of' indicates one should take the final letters.
The final letter of 'easter' is 'r'.
'a'+'r' is 'ar'.
'tot' going around 'ar' is 'TAROT'.
Can you help me to learn more?
(Other definitions for tarot that I've seen before include "Sort of cards" , "Sort of card" , "one may have been taken from deck" , "Card used for fortunetelling" , "Picture card" .)