Capital grandpa risked to some extent (5)
I believe the answer is:
paris
'capital' is the definition.
(capital of France)
'grandpa risked to some extent' is the wordplay.
'to some extent' says the answer is hidden in the clue.
'PARIS' is hidden in the letters of 'grandpa risked'.
(Other definitions for paris that I've seen before include "City; Juliet's betrothed Count" , "He abducted Helen of Troy" , "'''I love ... in the springtime'' (Cole Porter) (5)'" , "French city" , "City where one may see the Mona Lisa" .)