Sensitivity in arresting spooks succeeded for strategists (10)
I believe the answer is:
tacticians
'strategists' is the definition.
(I've seen this before)
'sensitivity in arresting spooks succeeded' is the wordplay.
'sensitivity' becomes 'tact' (being tactful is being sensitive).
'arresting' means one lot of letters goes inside another.
'spooks' becomes 'CIA' (spooks can mean spies).
'succeeded' becomes 's' (genealogical abbreviation).
'in' going around 'cia' is 'ician'.
'tact'+'ician'+'s'='TACTICIANS'
'for' acts as a link.
(Another definition for tacticians that I've seen is " Strategists".)