Movement as follows lion stopped by head of zookeepers (7)
I believe the answer is:
scherzo
'movement' is the definition.
(musical movement)
'as follows lion stopped by head of zookeepers' is the wordplay.
'as follows' becomes 'sc' (short for Latin scilicet- 'it follows' or 'namely').
'lion' becomes 'hero' (I've seen this before).
'stopped by' means one lot of letters goes inside another (I've seen this in other clues).
'head of' indicates taking the first letters.
The first letter of 'zookeepers' is 'z'.
'hero' enclosing 'z' is 'herzo'.
'sc'+'herzo'='SCHERZO'
(Other definitions for scherzo that I've seen before include "Lively passage" , "(In music) a brisk and lively movement" , "(Musically) a fast movement, usually in triple time" , "Eg acquiring this lively piece" , "Fast movement (mus.)" .)