Adolescent taking oven by road for restaurant (3,6)
I believe the answer is:
tea garden
'for restaurant' is the definition.
(I've seen this before)
'adolescent taking oven by road' is the wordplay.
'adolescent' becomes 'teen' (teenager).
'taking' is an insertion indicator.
'oven' becomes 'aga' (type of large oven).
'by' means one lot of letters go next to another.
'road' becomes 'rd' (abbreviation for road).
'aga'+'rd'='agard'
'teen' placed around 'agard' is 'TEA-GARDEN'.
(Other definitions for tea garden that I've seen before include "drinks here?" , "area for refreshments" , "Kind of plantation" , "Outdoor eatery" , "Outdoor cafe" .)