One in buff raised innocent (4)
I believe the answer is:
naif
'one in buff raised innocent' is the definition.
'naif' can be an answer for 'innocent' (I've seen this before). I'm unsure of the 'one in buff raised' bit.
'in buff raised innocent' is the wordplay.
'in' means one lot of letters goes inside another.
'buff' becomes 'fan' ('fan' can be a synonym of 'buff').
'raised' says the letters should be written in reverse.
'innocent' becomes 'i' (this could be a standard abbreviation of which I'm unaware).
'fan' reversed gives 'naf'.
'naf' placed around 'i' is 'NAIF'.
Can you help me to learn more?
(Other definitions for naif that I've seen before include "Artless" , "Innocent" , "Unworldly" , "Inexperienced" , "unaffected simplicity" .)