Take a long time about getting through, you admit (5)
I believe the answer is:
agree
'admit' is the definition.
(thesaurus)
'take a long time about getting through' is the wordplay.
'take' becomes 'r' (abbreviation for 'recipe', Latin for 'take').
'a long time' becomes 'age' (an age is a period of time).
'about' is an insertion indicator.
'getting through' becomes 'e' (I can't justify this - if you can you should give a lot more credence to this answer).
'r' put within 'age' is 'agre'.
'agre'+'e'='AGREE'
'you' is the link.
Can you help me to learn more?
(Other definitions for agree that I've seen before include "Say yes to a suggestion" , "Go well together" , "Concur - correspond" , "Shake on it" , "Enjoy view in common" .)