Learn about answer and stupid lies (7)
I believe the answer is:
realise
'learn' is the definition.
('learn'->'realize' is in my internal thesaurus and 'ize'->'ise')
'about answer and stupid lies' is the wordplay.
'about' becomes 're' (regarding**).
'answer' becomes 'a' (abbreviation eg in Q and A).
'and' says to put letters next to each other.
'stupid' indicates anagramming the letters (in a stupid order).
'lies' is an anagram of 'lise'.
're'+'a'+'lise'='REALISE'
(Other definitions for realise that I've seen before include "Achieve, make" , "net" , "Grasp" , "Become aware of something" , "Get the idea?" .)