Coy ferret went mad in food hall (9)
I believe the answer is:
refectory
'mad in food hall' is the definition.
'refectory' can be an answer for 'hall' (I've seen this before). I am not sure about the 'mad in food' bit.
'coy ferret went' is the wordplay.
'went' indicates an anagram ('go' can mean move).
'coy'+'ferret'='coyferret'
'coyferret' is an anagram of 'REFECTORY'.
Can you help me to learn more?
(Other definitions for refectory that I've seen before include "dining area" , "Monastic dining hall" , "Communal room for meals" , "Communal dining room" , "Communal dining-hall" .)