Look lad, finish off garden feature! (6)
I believe the answer is:
gazebo
'garden feature' is the definition.
(I've seen this before)
'look lad finish off' is the wordplay.
'look' becomes 'gaze' (gaze is a kind of look**).
'lad' becomes 'boy' (I've seen this before).
'finish off' means to remove the last letter.
'boy' with its final letter removed is 'bo'.
'gaze'+'bo'='GAZEBO'
(Other definitions for gazebo that I've seen before include "Small garden building for shade and rest" , "Small garden house with a view" , "Metrical feet" , "Summerhouse with views" , "Small summerhouse or open hut" .)