Does taking time prevent... (5)
I believe the answer is:
deter
'prevent' is the definition.
(I've seen this before)
'does taking time' is the wordplay.
'does' becomes 'deer' (I've seen this in another clue).
'taking' means one lot of letters goes inside another.
'time' becomes 't' (abbreviation).
'deer' going around 't' is 'DETER'.
(Other definitions for deter that I've seen before include "Try to prevent" , "Frighten off; prevent" , "Discourage, put off" , "Discourage (someone from an action)" , "Prevent by instilling fear" .)