Figure of old boy standing by pine? (6)
I believe the answer is:
oblong
'figure' is the definition.
(oblong is a kind of figure)
'old boy standing by pine?' is the wordplay.
'standing' says to take the initial letters.
'by' says to put letters next to each other.
'pine?' becomes 'long' ('long' can be a synonym of 'pine'**).
The initial letters of 'old boy' is 'ob'.
'ob'+'long'='OBLONG'
'of' acts as a link.
(Other definitions for oblong that I've seen before include "Roughly rectangular" , "Rectangle with adjacent sides unequal" , "tablet format?" , "Shape that's broader than long" , "Shape of a book" .)