Associate steam's end with burning coal (6)
I believe the answer is:
member
'associate' is the definition.
(I know that member is a type of associate)
'steam's end with burning coal' is the wordplay.
'end' says to take the final letters.
'with' says to put letters next to each other.
'burning coal' becomes 'ember' (I've seen this in another clue).
The last letter of 'steam' is 'm'.
'm'+'ember'='MEMBER'
(Other definitions for member that I've seen before include "Limb, MP" , "Person belonging to a particular group" , "Person in an organised group" , "One of a group or club" , "Part of body or one of a group" .)