Break in digit with end of flexor displaced (8)
I believe the answer is:
infringe
'break' is the definition.
(infringing is a kind of breaking)
'in digit with end of flexor displaced' is the wordplay.
'digit' becomes 'I' (I is an example).
'with' means one lot of letters go next to another.
'end' indicates one should take the final letters.
'displaced' becomes 'nge' (I can't explain this - if you can you should give a lot more credence to this answer).
The last letters of 'of flexor' are 'fr'.
'i' put after 'fr' is 'fri'.
'in'+'fri'+'nge'='INFRINGE'
Can you help me to learn more?
(Other definitions for infringe that I've seen before include "Neglect to obey" , "Violate" , "Encroach, impinge" , "Break (rule)" , "Transgress" .)