Put under wraps say for cardinal (7)
I believe the answer is:
integer
'for cardinal' is the definition.
(thesaurus)
'put under wraps say' is the wordplay.
'put under' becomes 'inter' (I've seen this in another clue).
'wraps' means one lot of letters goes inside another (inserted letters get wrapped up).
'say' becomes 'eg' (both can mean 'for example').
'inter' going around 'eg' is 'INTEGER'.
(Other definitions for integer that I've seen before include "Positive or negative whole number" , "Treeing (anag.)" , "The whole thing" , "rational number remains" , "One for example" .)