Recognise description of fake diamonds? (6)
I believe the answer is:
notice
'recognise' is the definition.
(noticing is a kind of recognizing)
'description of fake diamonds?' is the wordplay.
'description of fake' becomes 'not' (I can't explain this - if you can you should give a lot more credence to this answer).
'diamonds?' becomes 'ice' (I've seen this before).
'not'+'ice'='NOTICE'
Can you help me to learn more?
(Other definitions for notice that I've seen before include "Spot - review" , "Statement that one is to leave job on given date" , "'Perceive, observe (6)'" , "Poster; observe" , "Don't miss - review" .)