Play around in the corner, obviously (7)
I believe the answer is:
plainly
'obviously' is the definition.
(I know that obviously can be written as plainly)
'play around in the corner' is the wordplay.
'around' is an insertion indicator.
'the corner' becomes 'l' (I can't explain this - if you can you should believe this answer much more).
'in'+'l'='inl'
'play' going around 'inl' is 'PLAINLY'.
Can you help me to learn more?
(Other definitions for plainly that I've seen before include "obviously" , "In unconcealed fashion" , "Simply" , "Clearly" , "... without embellishment" .)