Understand, trendy place for tie — but be dressed down (3,2,2,3,4)
I believe the answer is:
get it in the neck
'understand' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'trendy place for tie but be dressed down' is the wordplay.
I cannot quite understand how this works, but
'trendy' could be 'in' ('in' can mean fashionable) and 'in' is found in the answer.
an anagram of 'tie' is 'eti' which is located in the answer.
'down' could be 'neck' (both can mean to finish a drink) and 'neck' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for get it in the neck that I've seen before include "Receive huge stick" , "reprimanded" , "suffer severely" , "Receiving a tracheotomy" , "Stop a rocket" .)