Power to secure the darts matches in successive locations (5)
I believe the answer is:
teeth
'power' is the definition.
('teeth' can metaphorically refer to effectiveness)
'the darts matches in successive locations' is the wordplay.
I cannot quite see how this works, but
an anagram of 'the' is 'eth' which is located in the answer.
The remaining letters 'te' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'to secure' acts as a link.
Can you help me to learn more?
(Other definitions for teeth that I've seen before include "enforcement mechanisms" , "Real effectiveness" , "Food may get stuck in them" , "Incisors, say" , "One may be armed to them" .)