See a point, possibly, in a heading (7)
I believe the answer is:
caption
'a heading' is the definition.
(caption is a kind of heading)
'see a point possibly' is the wordplay.
'see' becomes 'c' (the word for the letter, according to Chambers).
'possibly' is an anagram indicator.
'point' with letters rearranged gives 'ption'.
'c'+'a'+'ption'='CAPTION'
'in' acts as a link.
(Other definitions for caption that I've seen before include "Legend with a photograph" , "Explanation of an illustration" , "Explanatory words or heading" , "accompanying message" , "Elegance of dress" .)