The most common and most likely answer to this crossword clue is the 7 letter word PARTNER
I've seen this crossword clue in Independent
P
A
R
T
N
E
R
More clues leading to the result PARTNER
- Associate returning about new carriage
- Role taken by loveless emperor and associate
- Recall regular payment and criticize companion
- One's other half may be fantastic parent, right?
- Associate bit and cut short Roman emperor
- Standard rent in arrears, mate
- Opening strike recalled by colleague
- Other half of ripped carpet sent back
- Colleague‘s role facing loveless persecutor
- Consort with confederate
Buddy explains!

The straight part
We know that "colleague" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case colleague = partner.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PARTNER mean?
PARTNER noun- Someone who is associated with another in a common activity or interest.
- One of the pieces of wood comprising the framework which strengthens the deck of a wooden ship around the holes through which the mast and other fittings pass.
- A group financial arrangement in which each member contributes a set amount of money over a set period.
- To join as a partner.
- (often with with) To work or perform as a partner.