Nice white girl, observe, with short spear (3,5)
I believe the answer is:
vin blanc
'observe with short spear' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'nice white girl' is the wordplay.
I cannot really understand how this works, but
'white' could be 'blanc' (I've seen this before) and 'blanc' is found within the answer.
'girl' could be 'vin' and 'vin' is found in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for vin blanc that I've seen before include "French drink" , "White wine in France" , "(French) white wine" .)