Evidently give not enough away, being so secretive? (9)
I believe the answer is:
underhand
'not enough away being so secretive?' is the definition.
I can't tell whether this defines the answer.
'evidently give' is the wordplay.
'evidently' becomes 'under' (I can't justify this - if you can you should believe this answer much more).
'give' becomes 'hand' (synonyms).
'under'+'hand'='UNDERHAND'
(Other definitions for underhand that I've seen before include "servant of lower rank" , "might be deceptive" , "Crafty" , "Surreptitious" , "Displaying craft" .)