Congratulate art historian ringing such a connection (5)
I believe the answer is:
earth
'a connection' is the definition.
(I have seen 'Electrical connection' mean 'earth' so perhaps 'connection' could also mean 'earth')
'congratulate art historian ringing' is the wordplay.
'EARTH' is hidden in amongst the letters.
However, I'm not sure how the hidden word is indicated.
'such' acts as a link.
Can you help me to learn more?
(Other definitions for earth that I've seen before include "Solid ground" , "Third rock from the Sun" , "Heart (anag)" , "our home" , "costs so much?" .)