First or second, say (7)
I believe the answer is:
ordinal
I believe this clue is a double definition.
'first' is the first definition.
('first' is an ordinal number)
'second say' is the second definition.
('second' is the ordinal for the number two)
(Other definitions for ordinal that I've seen before include "Eg second" , "Old Iran (anag)" , "It shows your place" , "Relating to position in a sequence" , "Ranking number" .)