Name among Christian names (3)
I believe the answer is:
ann
'name' is the definition.
'among christian names' is the wordplay.
'among' indicates a hidden word.
'ANN' is hidden within 'christian names'.
(Other definitions for ann that I've seen before include "woman" , "eg Miss Widdecombe" , "Lady's name" , "- - Jones, 1969 Wimbledon champion" , "Girl" .)