Good-looking police officer, far from assertive (5)
I believe the answer is:
dishy
'good-looking' is the definition.
(I've seen this in another clue)
'police officer far from assertive' is the wordplay.
'police officer' becomes 'di' (detective inspector).
'far from assertive' becomes 'shy' (I can't justify this - if you can you should give a lot more credence to this answer).
'di'+'shy'='DISHY'
Can you help me to learn more?
(Other definitions for dishy that I've seen before include "Attractive" , "Good-looking (colloq.)" , "Gorgeous" , "Informally good-looking, like plate?" , "Good-looking (informal)" .)