Fancy a beer a lot, having gone off the rails (9)
I believe the answer is:
elaborate
'gone off the rails' is the definition.
I can't judge whether this defines the answer.
'fancy a beer a lot' is the wordplay.
'fancy' indicates an anagram.
'a'+'beer'+'a'+'lot'='abeeralot'
'abeeralot' is an anagram of 'ELABORATE'.
'having' acts as a link.
Can you help me to learn more?
(Other definitions for elaborate that I've seen before include "Highly detailed" , "involved" , "Explain details" , "Very ornate or complex" , "Ostentatious, possibly" .)