Backing singer taking drink with engineers (7)
I believe the answer is:
supreme
'backing singer taking' is the definition.
I can't judge whether this defines the answer.
'drink with engineers' is the wordplay.
'drink' becomes 'sup' (to sup is to drink).
'with' says to put letters next to each other.
'engineers' becomes 'reme' (Royal Electrical and Mechanical Engineers).
'sup'+'reme'='SUPREME'
Can you help me to learn more?
(Other definitions for supreme that I've seen before include "Paramount" , "Unrivalled" , "creamy dish of chicken perhaps" , "Highest in authority; rich cream sauce (dish)" , "Greatest, highest in excellence" .)