Try whisky, mid-morning in fancy dress (4)
I believe the answer is:
gown
'fancy dress' is the definition.
'gown' can be an answer for 'dress' (gown is a kind of dress). I am not certain of the 'fancy' bit.
'try whisky mid-morning' is the wordplay.
'try' becomes 'go' (both can mean an attempt).
'whisky' becomes 'W' (phonetic alphabet: alpha, bravo, charlie etc.).
'mid' indicates the central letters (mid- can mean the middle of something).
The middle of 'morning' is 'n'.
'go'+'w'+'n'='GOWN'
'in' is the link.
Can you help me to learn more?
(Other definitions for gown that I've seen before include "An evening dress" , "Formal robe" , "Academic (or evening) wear" , "Garment (academic, formal, or protective)" , "Shift" .)