Extremely naive about secret hold (7)
I believe the answer is:
enclose
'hold' is the definition.
(I know this)
'extremely naive about secret' is the wordplay.
'extremely' suggests removing the centre (only the extremes of the word are used).
'about' says the letters should be written in reverse.
'secret' becomes 'close' (I can't explain this - if you can you should give a lot more credence to this answer).
'naive' with its middle taken out is 'ne'.
'ne' in reverse letter order is 'en'.
'en'+'close'='ENCLOSE'
Can you help me to learn more?
(Other definitions for enclose that I've seen before include "Cover" , "Surround on all sides" , "Surround, envelop" , "Hem in" , "Confine" .)