British colleague showing mirrored work (4)
I believe the answer is:
oppo
'british colleague' is the definition.
'oppo' can be an answer for 'colleague' (informal UK term for colleague or friend). I'm not certain of the 'british' bit.
'showing mirrored work' is the wordplay.
'showing' becomes 'op' (I can't justify this - if you can you should give a lot more credence to this answer).
'mirrored' is a reversal indicator.
'work' becomes 'op' (abbreviation for opus).
'op' written backwards gives 'po'.
'op'+'po'='OPPO'
Can you help me to learn more?
(Other definitions for oppo that I've seen before include "Counterpart; rival" , "Colleague, friend (colloq.)" , "Mate" , "China" , "Opposite number (colloq.)" .)