Everybody's got the back of lovely colleague (4)
I believe the answer is:
ally
'colleague' is the definition.
(I've seen this before)
'everybody's got the back of lovely' is the wordplay.
'everybody' becomes 'all' (I've seen this before).
'got' is a charade indicator (letters next to each other).
'the back of' suggests the final letters.
The final letter of 'lovely' is 'y'.
'all'+'y'='ALLY'
(Other definitions for ally that I've seen before include "Co-operating person or nation" , "Band together" , "He fights on your side" , "mate" , "Team up" .)