Rally behind figure left by spymaster (8)
I believe the answer is:
assemble
'rally' is the definition.
(I've seen this in another clue)
'behind figure left by spymaster' is the wordplay.
I cannot really understand how this works, but
'behind' could be 'ass' (both can mean one's back side) and 'ass' is present in the answer.
'figure' could be 'l' (I've seen this in other clues) and 'l' is found in the answer.
'spymaster' could be 'm' (M is the head of MI6 in James Bond) and 'm' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for assemble that I've seen before include "Gather together at meeting place" , "Get together" , "fit together" , "Collect in one place" , "See lambs (anag) - gather together" .)