Ring true, possibly, in a superficial sense (5)
I believe the answer is:
outer
'ring true possibly in a superficial sense' is the definition.
I can't tell whether this defines the answer.
'ring true possibly in' is the wordplay.
'ring' becomes 'o' (**).
'possibly' is an anagram indicator.
'in' indicates putting letters inside.
'true' with letters rearranged gives 'uter'.
'o' inserted inside 'uter' is 'OUTER'.
Can you help me to learn more?
(Other definitions for outer that I've seen before include "Away from the centre" , "Poor shot" , "Outside; external" , "On the periphery" , "External kind of route" .)