I rang AA, distressed in wet place (7)
I believe the answer is:
niagara
'wet place' is the definition.
The definition suggests a singular noun which matches the answer.
'i rang aa distressed' is the wordplay.
'distressed' indicates anagramming the letters.
'i'+'rang'+'aa'='irangaa'
'irangaa' with letters rearranged gives 'NIAGARA'.
'in' is the link.
Can you help me to learn more?
(Other definitions for niagara that I've seen before include "Waterfall at Iran aga" , "Horseshoe, American and Bridal Veil Falls, collectively" , "North American waterfall" , "River linking Lakes Ontario and Erie" , "Great waterfalls on US-Canada border" .)