Sources claim groin is injured (7)
I believe the answer is:
origins
'sources' is the definition.
(I know this)
'groin is injured' is the wordplay.
'injured' indicates anagramming the letters.
'groin'+'is'='groinis'
'groinis' anagrammed gives 'ORIGINS'.
'claim' is the link.
This may not be correct. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for origins that I've seen before include "'Beginnings, starting points (7)'" , "Pedigree" , "Roots" , "Lines of descent" , "Where things begin" .)