Tall order for embassy (4,10)
I believe the answer is:
high commission
'embassy' is the definition.
(I know that High Commission is a type of embassy)
'tall order' is the wordplay.
I cannot quite understand how this works, but
'tall' could be 'high' (similar in meaning) and 'high' is located in the answer.
'order' could be 'commission' (commissioning is a kind of ordering) and 'commission' is found within the answer.
No letters remain.
This explanation may well be incorrect...
'for' is the link.
Can you help me to learn more?
(Other definitions for high commission that I've seen before include "What greedy salesman charges" , "Indian embassy in London, say" .)