Rambling mile, happening outside, they organise well? (6)
I believe the answer is:
oilmen
'they organise well?' is the definition.
The definition suggests an adverb but the answer is not.
'rambling mile happening outside' is the wordplay.
'rambling' indicates an anagram.
'happening' becomes 'on'.
'outside' is an insertion indicator.
'mile' with letters rearranged gives 'ilme'.
'ilme' placed inside 'on' is 'OILMEN'.
Can you help me to learn more?
(Other definitions for oilmen that I've seen before include "Businesspeople" , "crude workers?" , "riggers, perhaps" .)