Writer of top spy book upset about bloomer (9)

'writer' is the definition.
(I have seen 'biographical writer' mean 'memoirist' so perhaps 'writer' could also mean 'memoirist')

'of top spy book upset about bloomer' is the wordplay.
I cannot really see how this works, but
'of' could be 'o' and 'o' is located in the answer.
'top' could be 'ist' (resembles 1st) and 'ist' is found in the answer.
'spy' could be 'm' ('M' is James Bond's boss) and 'm' is present in the answer.
The remaining letters 'emir' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?