I will leave prodigy for a related group (5)
I believe the answer is:
genus
'related group' is the definition.
'genus' can be an answer for 'group' (genus is a kind of group). I am not certain of the 'related' bit.
'i will leave prodigy' is the wordplay.
'will leave' indicates named letters should be taken away.
'prodigy' becomes 'genius' (I've seen this before).
'genius' with 'i' taken out is 'GENUS'.
'for a' acts as a link.
Can you help me to learn more?
(Other definitions for genus that I've seen before include "Class of animal" , "species grouped together" , "Taxonomic group (biol.)" , "Part of the family" , "Kind or sort of" .)