Great Dane barking in outdoor cafe (3,6)
I believe the answer is:
tea garden
'outdoor cafe' is the definition.
(I've seen this before)
'great dane barking' is the wordplay.
'barking' indicates an anagram (UK slang for mad).
'great'+'dane'='greatdane'
'greatdane' anagrammed gives 'TEA-GARDEN'.
'in' acts as a link.
(Other definitions for tea garden that I've seen before include "Outdoor eating area" , "Outdoor eatery" , "trombonist" , "Open air cafe" , "Open-air restaurant for afternoon use" .)