Hide bit of wood around new section of course? (7)
I believe the answer is:
furlong
'section of course?' is the definition.
(section of a racecourse)
'hide bit of wood around new' is the wordplay.
'hide' becomes 'fur' (I've seen this before).
'bit of wood' becomes 'log'.
'around' indicates putting letters inside.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'log' going around 'n' is 'long'.
'fur'+'long'='FURLONG'
(Other definitions for furlong that I've seen before include "One eighth of a mile" , "Imperial unit of length, an eighth of a mile" , "One-eight of a mile" , "Measure of distance" , "A few chains" .)