Descent described by eagle? (7)
I believe the answer is:
lineage
I believe this clue is a double definition.
'descent' is the first definition.
(synonyms)
'described by eagle?' is the second definition.
(the word 'eagle' is 'l' in 'eage')
(Other definitions for lineage that I've seen before include "Pedigree, family tree" , "Descent from ancestors" , "Family descent" , "Descent (from an ancestor)" , "The strain" .)