Goldilocks beginning to wander in small wood (5)
I believe the answer is:
grove
'small wood' is the definition.
(I've seen this before)
'goldilocks beginning to wander' is the wordplay.
'beginning to' says to take the initial letters.
'wander' becomes 'rove' (synonyms).
The initial letter of 'goldilocks' is 'g'.
'g'+'rove'='GROVE'
'in' is the link.
(Other definitions for grove that I've seen before include "Small wooded area" , "Writer on music" , "Dictionary-maker" , "Hurst" , "Small growth of trees" .)